Malicious PDF — malware analysis report

Static analysis result for SHA-256 8322414503c61943…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 11:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2035b2b14b92875236fbba49c9431fc9 SHA-1: 4e11e098cba8ec29a93b095a9af8a395629e5cae SHA-256: 8322414503c61943506c74e0b06f2a5b817b818307c2c8aea7043393b9401713
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent link, disguised as a free dictionary download, redirects to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=afaan+oromo+dictionary+free+download+pdf
    • http://files.thedepontes.com/uploads/1/3/2/6/132681836/4810584.pdf
    • http://files.nataliebratcher.com/uploads/1/3/1/3/131381288/zidinetudor_wezavibovin_memak.pdf
    • http://files.arlingtonmsband.com/uploads/1/3/1/6/131606087/ddee7.pdf
    • http://kiruwa.ljayhair.com/uploads/1/3/0/8/130814328/6019747.pdf
    • http://files.centraleuropeanstringquartet.com/uploads/1/3/0/8/130814492/labumu_vokovexevaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/nedesaxumumorip.pdf
    • https://cdn.shopify.com/s/files/1/0433/6615/4394/files/wefofegeloputazirabilate.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/gakinubi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/derivation_of_simple_bending_equation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0635/2804/files/zaxorapiterepivomemalura.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8381/files/muzibugamuximaxasulorow.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/kimelari.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/14159166874.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/fudarajir.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/18976096736.pdf
    • https://cdn.shopify.com/s/files/1/0434/6989/7878/files/guzunojugaduv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/filosokolovaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/78915692544.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005049.bin
fc30847e8e63769470272f7cce71710d44851f1f98b14559ee063a3f41b95dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5049 5308 bytes
font_01_sfnt_off00006258.bin
7a492b1221a6f5b3d6bb2417b3540f6b995a34f10f4d294c5f185b5fc30007b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6258 10144 bytes
font_02_sfnt_off00008565.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8565 16144 bytes

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