Malicious PDF — malware analysis report

Static analysis result for SHA-256 6278cbcc4eba0d66…

MALICIOUS

PDF

45.6 KB Created: 2020-08-05 05:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10bff3d2c70068df0177ca91ae9ac9fb SHA-1: ac7a5b68ac5133ec65ca59fba190b3ec942fbcea SHA-256: 6278cbcc4eba0d66f3f52300db653c23a6e568fa54c160a427ae68b752eac80e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'Wiley study guide cfa level 2 pdf'. The presence of a link farm and a critical heuristic firing for a malicious redirector indicates an attempt to direct users to harmful content. While no scripts were directly extracted, the PDF structure itself facilitates the malicious redirection.

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=wiley%20study%20guide%20cfa%20level%202%20pdf
    • http://files.crudeoilcalendars.com/uploads/1/3/1/3/131383255/wagetalonipijetemer.pdf
    • http://files.kaisongnichols.com/uploads/1/3/1/4/131452922/xisut.pdf
    • http://files.nepscholarshipfund.com/uploads/1/3/2/7/132710628/5030960.pdf
    • http://files.loyalsockband.com/uploads/1/3/1/1/131164168/1575759.pdf
    • http://gurudesa.alliesandfriendsmn.org/uploads/1/3/0/7/130776661/kedibumareku-guned-rilofamifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/motaxirujasugusenufujuwew.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/tiwedamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/13270944331.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/form_5472_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rowogumidakedodovejizana.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/35164462313.pdf
    • https://cdn.shopify.com/s/files/1/0440/7132/1752/files/80641254532.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/50127349117.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/social_problems_5th_edition_john_macionis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/1177716733.pdf
    • https://cdn.shopify.com/s/files/1/0434/2215/4908/files/luwevuwimo.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_off0000700e.bin
c449a5f1de2b46e6212a6fd332990a2c608081a69449d15e9ff6c91e6a710184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700E 5532 bytes
font_01_sfnt_off00008321.bin
f69c8f418f99ab434f094a97c8170075a9a1335e7e6d24686d0243b58e11a99f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8321 11076 bytes

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