Malicious PDF — malware analysis report

Static analysis result for SHA-256 079fb41ca0d059a9…

MALICIOUS

PDF

45.8 KB Created: 2020-08-06 21:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7131b342e5da646bccde51490a1f1427 SHA-1: 776641ffe3c1650744f139b0600b81c5f6c42534 SHA-256: 079fb41ca0d059a9a46151e920c4d5e6751b138b776b68cdc176534f1a3959bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to link farms designed for SEO manipulation, and one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the malicious redirector link, suggesting an attempt to disguise the malicious destination. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=edmund+spenser+sonnet+75+pdf
    • http://files.dognationmotors.com/uploads/1/3/1/3/131384171/zatow.pdf
    • http://files.stahlmennonite.org/uploads/1/3/2/6/132682585/dixixegoletanev-lokigagunojov-rivupejutuwule-visaremuxis.pdf
    • http://files.riverbendins.com/uploads/1/3/1/8/131856071/nenixebamiv-voxijelazulupo-xikalibugezim-rakuletoligixiw.pdf
    • http://files.moocsandlibraries.org/uploads/1/3/1/3/131380308/duzebilufewu-bowukuxexu-renopapuvamuku.pdf
    • http://files.adriannamoyer.com/uploads/1/3/0/8/130874284/1252784.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/sejodulezobobizo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/gutarobigaza.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/55270358360.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/29661756226.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/zezofegodomid.pdf
    • https://cdn.shopify.com/s/files/1/0440/1666/4734/files/17985215062.pdf
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/wavuxavedojotaxaworimewe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/www_tinymoviez_com.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/51208704295.pdf
    • https://cdn.shopify.com/s/files/1/0437/3004/3041/files/percy_jackson_graphic_novel.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000743d.bin
262a79b3539cea41e86063f46dfe58887887b63f12464b48480d27cf17a6f011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743D 5108 bytes
font_01_sfnt_off00008598.bin
3814ee61466e15772a2905fb683fd48beb8c189294b74fcce716367aaa8a43fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8598 10304 bytes

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