Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd839464bd78612…

MALICIOUS

PDF

45.1 KB Created: 2020-08-07 22:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeda5b6788fa57609b7c0d0f7425b37b SHA-1: 8fa1869aa81b3aa2431a1634b792189498c22e5d SHA-256: dcd839464bd78612b1551ece9aa7537a390d5052bbe99e9c6a4178c1423d888a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is largely unreadable binary data, but the presence of the malicious redirector and the link farm are sufficient indicators of malicious intent.

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.com/pify?keyword=aide+m%25C3%25A9moire+math%25C3%25A9matique+secondaire+1+pdf
    • http://kopuxuji.sstartravel.com/uploads/1/3/1/3/131383791/3037696.pdf
    • http://files.belovedcommunitysp.org/uploads/1/3/1/6/131606256/jusulipaterij-wiluzazivu.pdf
    • http://files.nervouscurtains.com/uploads/1/3/1/1/131164236/rawapatazaretaz_ronotalovoj_zubas_rukizaxogi.pdf
    • http://files.liairelandprospectuk.org/uploads/1/3/1/4/131406430/3548343.pdf
    • http://tigigidap.charlotteshelix.net/uploads/1/3/1/4/131453541/99cf7e15.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/famuwovodotagaposolezudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6330/3575/files/taking_cara_babies_abcs_of_sleep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vepotarinaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/kunupok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7949/8918/files/tibufitofusanaxovelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/68923749207.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/76179041471.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/49931335352.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/pozozanotepamogolovene.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/45673644740.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/lifodewopineladaxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3315/7014/files/low_back_pain_strengthening_exercises.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d5d.bin
af5af742524be3e1fd6ecf7a4f8c0d0bb57765c5583310e27ef19dfae5983006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5D 5672 bytes
font_01_sfnt_off0000803d.bin
9bb4521cf5ebfcb651d58c45b24ef2443f7b1a688ff194eadb202be371e7d685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803D 11456 bytes

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