Malicious PDF — malware analysis report

Static analysis result for SHA-256 742c839a92063080…

MALICIOUS

PDF

54.0 KB Created: 2020-08-13 05:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b4222b38537acc008ef0ebcac4ab354 SHA-1: 395172b5e386b39d264deb4b6748909ef47c7e3f SHA-256: 742c839a92063080fef52367420ab9e339ffd0c44b10cc17212d56bf523562f1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector, suggesting an attempt to lead the user to malicious content. 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.cc/wb?keyword=exercice%20uml%20diagramme%20de%20classe%20avec%20correction%20pdf
    • http://fozomewi.musicin233.com/uploads/1/3/0/7/130776401/e6ee1b.pdf
    • http://files.hiltonheadbtar122.com/uploads/1/3/0/9/130969740/vonopobexiledid.pdf
    • http://femefev.diseaseecology.org/uploads/1/3/1/3/131379899/sewejikilog-xobeli.pdf
    • http://files.mylocalguideistanbul.com/uploads/1/3/1/8/131856009/reveni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32773531818.pdf
    • https://cdn.shopify.com/s/files/1/0445/3246/5828/files/guia_turismo_bogota.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/48791463612.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/vubenelujitiko.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/engineering_manager_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0447/8589/3542/files/gta_cheat_codes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5937/9357/files/pendidikan_kewarganegaraan_di_amerika_serikat_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/wet_chemical_synthesis_of_nanomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0434/0829/4044/files/15768054751.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/bokatadirudi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6100/8791/files/battlemech_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/8563941719.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/bonemujokode.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_off000089c2.bin
b59da0cba76714c421bbaff6b4a31e0469e42907500731771088e829cd6f0967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C2 5560 bytes
font_01_sfnt_off00009ca6.bin
c18a14584096d918ec660c7226285d87317c8eae255050b8d518660cf3fc1616		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA6 15024 bytes

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