Malicious PDF — malware analysis report

Static analysis result for SHA-256 31366d16d05171ed…

MALICIOUS

PDF

48.3 KB Created: 2020-08-30 21:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8f8d3f5517bf502f14f5e14064fa10e2 SHA-1: d82564a17f30a5d2d69c4395c981526a53d5e30a SHA-256: 31366d16d05171edbade32a80f8115c2fecff22895222e9ce7f82dda17bc478a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=pixelmon+3.5.7+download'. This indicates the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or credential harvesting. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to increase visibility and lure unsuspecting users. No scripts were extracted, and the document body is heavily obfuscated, but the malicious redirector is the most prominent indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=pixelmon+3.5.7+download In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/analogias_y_distribuciones_numericas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/fejuwawate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/jinivowetunajabosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9824/4007/files/bachelor_of_social_science_short_form.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1cc9a21817e24df2867177d881349732.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_db3c08653dbf460793325522e1576ce8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cc089a_c6ec86f5106a492a90faa4db4c405d5e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6cfc61_2cc986cfb34740d6807d176939f6d773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/dalux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/roworegemax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/27671689198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5533/3027/files/40502943569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3669/5959/files/past_simple_and_past_continuous_worksheets_with_answers.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_7499261b048c48148410d7ed21b63506.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0aab01_306ceb66294d464da91ff89087aeecce.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_309d3788342445719e2095d9328c32d2.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D3 3852 bytes
SHA-256: 8af2eabde4371e36eb40e219f556bbb52a3826fefb664541be0884baa7573dc7
font_01_sfnt_off00006798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6798 5260 bytes
SHA-256: 458893451a0c0f164994c0d0158e8cc05fcecb013dffe370aa242fab66c895e5
font_02_sfnt_off0000798b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798B 10536 bytes
SHA-256: d986c0a0a10fb40a8c79fa9f179b291ed6061c4bfb07fad08d0bbe3ebfbea36e
font_03_sfnt_off00009d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8E 16064 bytes
SHA-256: f7fb55aa7df24da556f1e6a14ff3e973b5c7274e6851c040e899454d18355684