Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6a4276a870e08f…

MALICIOUS

PDF

57.0 KB Created: 2020-08-08 14:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75c321c68146632bfa4eadd0b5e3a480 SHA-1: 515b8227c6fa9701650db23ad93a94aadfae2808 SHA-256: 6d6a4276a870e08fa2bb0c1166e9787c7ed8f0615584f20254d3cc7478c59042
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic suggests the document is part of a link farm, likely intended to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded link is the primary indicator 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.com/pify?keyword=barbeau+test+pdf
    • http://fotexogut.kev-m.com/uploads/1/3/0/7/130739553/5613ab631.pdf
    • http://files.totalityauthenticlife.com/uploads/1/3/1/4/131483153/biwisilarule.pdf
    • http://files.athenselks973.org/uploads/1/3/1/3/131398195/pozoxapof_sokinebemek_pibixeneruli_pepavabedisan.pdf
    • http://files.immaculateconceptionstmarys.com/uploads/1/3/2/6/132695698/e54e7597.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/duxegusisasa.pdf
    • https://cdn.shopify.com/s/files/1/0445/3220/3679/files/chemistry_for_today_8th_edition_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/5481/5640/files/lapakef.pdf
    • https://cdn.shopify.com/s/files/1/0432/4442/1282/files/fasetegu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6159/8616/files/form_g-_45.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/66612713019.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/sailor_moon_r_movie_tickets.pdf
    • https://cdn.shopify.com/s/files/1/0433/3263/2730/files/4589235815.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/vosijilabuga.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/fegorasipotopun.pdf
    • https://cdn.shopify.com/s/files/1/0428/8924/8927/files/zaxemubojeregusulep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000090a8.bin
bcd49d5abacfd1bedfcb0e43230973fbe26a071ad2debb48ab9dec4eb60bd3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A8 4808 bytes
font_01_sfnt_off0000a106.bin
4d239d98b79f4b0c5e533ee898e235b33e164e032db8c5439f4648be291aa977		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA106 12288 bytes
font_02_sfnt_off0000c925.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 4324 bytes

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