Malicious PDF — malware analysis report

Static analysis result for SHA-256 591a6f07f7d945b9…

MALICIOUS

PDF

42.6 KB Created: 2020-08-26 18:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e432d09af7bce07fc40c727689d27dae SHA-1: 3204f52122ec43b6ad8ab7fb58d8f35fd0e35399 SHA-256: 591a6f07f7d945b9fa04bfd7a976d8d524b6e9488b966c7b61567aa057d6991e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=ejercicios+tiempos+verbales+espa%25C3%25B1ol+para+imprimir'. The document body, though heavily obfuscated, contains text related to Spanish verb tenses, likely a lure to encourage clicks on the embedded malicious links.

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.ru/pify?keyword=ejercicios+tiempos+verbales+espa%25C3%25B1ol+para+imprimir
    • http://galuxaga.smallgroupsministry.com/uploads/1/3/0/8/130815026/4433684.pdf
    • http://lupeb.daydreamscakecompany.com/uploads/1/3/0/9/130969153/3202823.pdf
    • http://jitikifi.womenintrousers.org/uploads/1/3/0/7/130776225/veporelej-vimikonod-majofak-dupoj.pdf
    • http://files.becksusedappliances.com/uploads/1/3/0/7/130738803/daramozobugonorives.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/xubaxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/applications_of_composite_materials_in_automobile.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/gamasowuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0935/files/autumn_leaves_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/3593/2310/files/as_28_icai.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/756677024.pdf
    • https://cdn.shopify.com/s/files/1/0463/2667/7665/files/well_did_you_evah.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/62231161509.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6773/files/node._js_tutorial_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/javoxudoxuvikafutudotetut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/warrior_fury_talents.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_off000065cc.bin
243d61cf69d5cc2a62778dfc833c7569a06b474ea58b9cc9367f06988106f467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CC 5524 bytes
font_01_sfnt_off00007842.bin
920fe3879144e74db7711581bd5a27a1591b4067e93da9d1ae56bb9ebb4f4f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7842 10616 bytes

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