Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59f9307c0cb1a6b…

MALICIOUS

PDF

44.4 KB Created: 2020-08-20 13:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d480fe2d12f5fcd4da23c868e220b96c SHA-1: 3348f2aeea19c0702cbc526833f7abfa6ce61415 SHA-256: a59f9307c0cb1a6b1943be3181fb51745436832724921b533a9feb71114ea8ee
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=substitution+method+worksheet'. The document body, though partially obfuscated, also contains this URL, suggesting an attempt to disguise malicious links as content. The presence of numerous external PDF links further supports the classification as a link farm, designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=substitution+method+worksheet
    • http://files.knockouthumor.com/uploads/1/3/0/8/130874240/pawebowokenegobefabe.pdf
    • http://fefeza.teamlearningservices.com/uploads/1/3/1/3/131398362/tewasefiko.pdf
    • http://files.restorationchurchgb.org/uploads/1/3/0/7/130739470/4619879.pdf
    • http://files.yarmouthportlibrary.org/uploads/1/3/1/4/131482853/xemarenulavilus-tadutisosame.pdf
    • https://cdn.shopify.com/s/files/1/0446/0707/8564/files/free_sample_lease_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesibilefonupas.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4838/files/deravutatojexu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/fivegipezizuzofajafomupuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/75397802735.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/57655415605.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/nudenugujozusureluk.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/cetoprofeno_injetavel_bula.pdf
    • https://cdn.shopify.com/s/files/1/0429/0949/9558/files/63651981935.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/fil

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ac.bin
4d031993e1753e7d2d3d7c7238d05deee14304d17da865f034d409392aaddf09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AC 5104 bytes
font_01_sfnt_off000072d4.bin
1492b38ab14923b5349ae64919351f329d94638ad90544a45a67170e0be20fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D4 10396 bytes
font_02_sfnt_off0000963c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x963C 4324 bytes

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