Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87c794278c49f3c…

MALICIOUS

PDF

41.9 KB Created: 2020-07-14 09:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeb8931e3223768c717af1a7fa34dd67 SHA-1: 19c159e8d542578e863844ebc04ac8d2edc7111c SHA-256: d87c794278c49f3cc0d01e22b9b1b72ff2fd4ad8c9836a1a02daf3d01f7b326b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as revision notes, which leads to a link farm. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs points to a phishing or redirection scheme. No scripts were extracted from this sample.

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=a%20level%20physics%20revision%20notes%20pdf
    • http://files.byrdhouseandladybugs.com/uploads/1/3/0/7/130740342/notasemiwovevo.pdf
    • http://files.naturallymusicalstudio.com/uploads/1/3/1/6/131637037/d047378c8.pdf
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
    • http://files.ourfrenchimpressions.com/uploads/1/3/0/7/130739037/5b906a2348.pdf
    • http://files.primrosetable.com/uploads/1/3/1/3/131381471/923578.pdf
    • http://files.darajamusicinitiative.org/uploads/1/3/2/7/132710683/gizuvuxab_galipo.pdf
    • http://files.outoftheboxphotography.net/uploads/1/3/1/4/131438468/1338414.pdf
    • http://files.savefarthingworthgreen.org/uploads/1/3/1/0/131071056/637333bab2f0.pdf
    • http://files.wavesofwords.org/uploads/1/3/1/4/131453651/fowidowegu.pdf
    • http://files.conjunctionmedia.com/uploads/1/3/1/4/131437983/jumeferavesij.pdf
    • https://mafegazavete460328079.files.wordpress.com/2020/06/wasoxajitofomifij.pdf
    • https://migeleki.files.wordpress.com/2020/07/99759774539.pdf
    • https://xilawirusit.files.wordpress.com/2020/06/penor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7913659608.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/wilifo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/degivebisodinew.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/48689481943.pdf
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/kurebugakewigiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/zuvezatiwewesukorulafe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/veperadasomeragik.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/sokofifitinuv.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006815.bin
3bf7c45829a94229122ae0a7977fcfc26380d02b67fc95d35220f25ae9691493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6815 4972 bytes
font_01_sfnt_off000078fb.bin
6b535b50e4dc50eb77dab706435d539862d534e3e793de95ba9253224ce4fcb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FB 9712 bytes

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