Malicious PDF — malware analysis report

Static analysis result for SHA-256 034877f77c13f49f…

MALICIOUS

PDF

46.9 KB Created: 2020-08-11 15:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf2e586bf8a68e1ac69582d4d0a4f66b SHA-1: fe64fbec44da1427289755847fd31f3787d6afb3 SHA-256: 034877f77c13f49ffc9d679d84109e54990e83e5748ee28bc6a9c6eb571bec01
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a redirector known to host malicious content. The document body, though heavily obfuscated, contains a URL that is likely intended to lead the user to a malicious site. This behavior is consistent with a link farm or SEO poisoning attack designed to redirect users to malicious infrastructure.

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/wb?keyword=optoelectronic%20devices%20pdf
    • http://files.nxintl.com/uploads/1/3/1/0/131070911/nufawefomojoge_tadugusovok.pdf
    • http://files.bodilheggo.com/uploads/1/3/0/7/130776504/kizojogewax_lewezodikewup.pdf
    • http://files.bloorstreetsound.com/uploads/1/3/0/8/130814290/242bb.pdf
    • http://files.angmeringflowershow.co.uk/uploads/1/3/0/7/130775197/6552449.pdf
    • http://files.xplicator.info/uploads/1/3/1/8/131871704/292b6b1e6fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/63850209534.pdf
    • https://cdn.shopify.com/s/files/1/0429/5960/1830/files/xeninevuruwufamemulezigen.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/veligalosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/indesign_to_converter.pdf
    • https://cdn.shopify.com/s/files/1/0428/3006/9927/files/human_heart_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/differential_centrifugation.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/asking_and_giving_directions_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0437/5255/4657/files/98256197293.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/kaspersky_activation_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/4998/files/thule_fit_kit_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6841/files/xabixomavafegorabexoxovuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/zupedazazok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/wuwumukilubemitolamoxosu.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_off000065de.bin
a1a84fc7d95d18bcd7fd3b4ff0665e7616c1021e1052ee2c3500780de33b9fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DE 5028 bytes
font_01_sfnt_off0000770e.bin
c0efccd03d54b026c55e0f8f1825e7cf8599b4df8a8ded8a516fea1aad61d19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770E 9944 bytes
font_02_sfnt_off0000993f.bin
49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x993F 16148 bytes

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