Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce81021c2137cd6a…

MALICIOUS

PDF

72.0 KB Created: 2020-08-07 08:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a43d0faa106289e72090d06e9e897e23 SHA-1: c5bacef09a75cb7c2eacb80d92e024c030ab5b16 SHA-256: ce81021c2137cd6aecd64d24aa993d52c0189904f422b20a5126e2a0bd001c79
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=bhaskara+1+biography+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, likely to improve search engine ranking for 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.ru/pify?keyword=bhaskara+1+biography+pdf In PDF document text
    • http://funemofib.dankoairguns.com/uploads/1/3/0/9/130968921/wanoja.pdfIn PDF document text
    • http://files.hmongunited.org/uploads/1/3/1/3/131380005/ecf026c75.pdfIn PDF document text
    • http://files.anthamation.com/uploads/1/3/0/7/130776200/6260965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9518/6851/files/92922655535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5784/8224/files/941_angel_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3393/5515/files/lejem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8252/2528/files/return_to_blockland.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/algebra_practice_test_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2501/4684/files/25489971958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/zagajuroviw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/43095252815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2733/2245/files/54639645821.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/xomagusewej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0691/7799/files/68292955221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9266/3702/files/kiwevovo.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
🗂 Part of campaign: anthamation.com 3 samples

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA771 5680 bytes
SHA-256: 51311e9bc5fef7bfbf21019695e1c4d02c9d485b555c838349da254eca80716b
font_01_sfnt_off0000baca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACA 6460 bytes
SHA-256: 44971ce04f3d98717dcecb2c167d852ed4dec76d646454f0ebe8422407e21584
font_02_sfnt_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 14496 bytes
SHA-256: fdc26627fbf011f9bef789f5ef1b0157fc1f26be78e22054f0e52629eb898b1c
font_03_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550