Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67e33441666e9e1…

MALICIOUS

PDF

40.7 KB Created: 2020-08-07 07:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e5edab4316b0dac0da273d9942f3fade SHA-1: 40fb9e2da01f07c9be2028b8b9412ef657356eb6 SHA-256: b67e33441666e9e137ef9e9ace00884e771111562367fd59db34d499021d4992
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to appear as legitimate PDF downloads, but one of the primary links redirects to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body text, though garbled, contains keywords related to PDF downloads, reinforcing the lure. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content.

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/pify?keyword=bengali+to+english+speaking+course+pdf+download In PDF document text
    • http://files.classiccitychef.com/uploads/1/3/0/8/130874192/vadib.pdfIn PDF document text
    • http://files.stjohnsatown.com/uploads/1/3/0/7/130739393/1220507.pdfIn PDF document text
    • http://files.loesshillsalliance.com/uploads/1/3/2/8/132814463/fe142ae52.pdfIn 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/1/0430/0675/4970/files/way_back_into_love_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/grammar_english_oxford.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2986/3323/files/15797167167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/69051512702.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1345/1430/files/calendario_liturgico_2020_italiano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/notovugonowugiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/35544784421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/lupiwijumawijosug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0247/0306/files/neneleterofonenadovuvovir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2247/3624/files/history_of_ancient_egypt_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/fijidodefus.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E56 5624 bytes
SHA-256: 2563ddeb4edd6b5386d53b515d791c33909addf002b5fb7157bb6db9a1975b72
font_01_sfnt_off00006182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6182 5456 bytes
SHA-256: cf2ab647059e12d3483ee85da786aa2ec0281b7c331542e7ac553c74fa63e661
font_02_sfnt_off0000730c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730C 10160 bytes
SHA-256: 9c7e5d2d2ec24d21cbb1c512bb7e015bd8f3232341a281d77cbf8744d3ec3786

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