Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcfd69a7a340f05…

MALICIOUS

PDF

41.4 KB Created: 2020-09-17 10:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69cff3075e3abd95f375898c5bcf7140 SHA-1: a56ff95d660f1fcf3520feb6aee46338ce5455e1 SHA-256: 6bcfd69a7a340f050174a9a692c0e1ae19c2b80e88cca0fc3c2b34c6c8cfaaac
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. The presence of a link farm heuristic further suggests an intent to distribute malicious content or engage in phishing. No scripts were extracted, but the embedded links are sufficient indicators of malicious intent.

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.link/wix?keyword=overwatch+penalty+for+leaving+quick+play
    • http://files.vinylbandits.com/uploads/1/3/0/7/130738673/bukogod-mugufidanamuxak.pdf
    • http://nekekubo.thedailydelaney.com/uploads/1/3/0/8/130814085/d3ff9e.pdf
    • http://files.cantormalachi.com/uploads/1/3/1/4/131409884/zivun-sevafuf-tedupiwomiwati.pdf
    • http://tisiwegab.iowasubtleimageryphotos.com/uploads/1/3/1/4/131438580/69bdec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6653/0721/files/que_es_la_democracia_participativa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2290/1663/files/dewegixomukuzenunozizujel.pdf
    • https://cdn.shopify.com/s/files/1/0439/0869/4171/files/sibuxuwekegutemor.pdf
    • https://13a29e59-92ac-4ac7-9e47-8c24cd7307e6.filesusr.com/ugd/0fdb6d_b7eee557f57f473a8e273e373be9738f.pdf?index=true
    • https://03916d10-1e80-4ef7-ab59-d0693fe75f39.filesusr.com/ugd/c1de29_33f8664d9a374e87bff5311ca7399d88.pdf?index=true
    • https://5472920a-6516-4d59-b0e9-8774922a3456.filesusr.com/ugd/90423f_ff843b993b874d09bafdf6e41f5eafd3.pdf?index=true
    • https://b969e05a-fc0b-45d0-9227-16342b0507e5.filesusr.com/ugd/197ed4_a594a85c46ec4f399b44b9ca5640a530.pdf?index=true
    • https://aa177bd6-b98e-4752-abbe-f2437949421c.filesusr.com/ugd/bcb9fd_c0d41849914f4051b8a8e8b8bddc6e05.pdf?index=true
    • https://817153ab-3ffd-424d-9095-ab8abf8483c6.filesusr.com/ugd/bdc04d_1fa1b5952c5a4dbbbf97f13487af606e.pdf?index=true
    • https://64054d8b-ec1e-48c5-ab75-26dd581ecda5.filesusr.com/ugd/ea2c45_a0aa6213c1ac4260965dc4533022b45a.pdf?index=true
    • 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_off0000615a.bin
b02cf6bf8df3116eaf918368c8636e014d392809dd6b8cc37866f302baad7daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615A 5568 bytes
font_01_sfnt_off0000746e.bin
73874618df4a4a8fc5383962c2e92c5788e9d7e82f77e7a971d9ff4d774da264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746E 10744 bytes

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