Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2b7e0bb1ebd11c…

MALICIOUS

PDF

39.8 KB Created: 2020-08-10 16:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee7bc35a8a3f9a667d8e26edf3e0bd8a SHA-1: 0dfa36bd9c7a96500c1fe86a6f944b996aa73df0 SHA-256: 5d2b7e0bb1ebd11c0dd92a7d9104046f0f9d57fd6327b0b6858c819f90f5c245
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to appear as educational resources, but the primary link redirects to a malicious domain. This indicates a phishing or scam attempt, likely to deliver a secondary payload or redirect to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=new+general+mathematics+textbook+for+ss2+pdf
    • http://files.hermadarmstadt.com/uploads/1/3/1/4/131408172/vozupitezefakaxaz.pdf
    • http://files.super-sounds.com/uploads/1/3/1/4/131437984/poxoguw.pdf
    • http://buwab.mshansmusic.com/uploads/1/3/2/7/132710712/ccc7f1cd441d3e6.pdf
    • http://files.dibiasedimillo.com/uploads/1/3/1/3/131384635/funoguvor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/rexituzij.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/12021666267.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/98472900368.pdf
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/5058943876.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/rajaradomebilijifaludub.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5745/files/electronique_numrique_bascules_exercice_corrige.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5424/files/mazuxutixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/ragumexarodupitubasawulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/15142627725.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/gogonewanaziwuto.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/lutiruge.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.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_off00004de9.bin
6f88d5c24bc07535ec56c67a1f7fd41056c0341d7d540f56b9971690ca93a72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE9 5824 bytes
font_01_sfnt_off0000619e.bin
a6e1ca1696cacdd87d54124dcb50ad8086fa041e10fac096788f75aee651c430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619E 10076 bytes
font_02_sfnt_off000083e0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E0 4324 bytes

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