Malicious PDF — malware analysis report

Static analysis result for SHA-256 0992231182724a4e…

MALICIOUS

PDF

44.9 KB Created: 2020-08-20 20:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a94682f89c82853f4559726e8bebd35b SHA-1: 3a4118318f0f5b6f423ca1c3f358e2eb3b74decd SHA-256: 0992231182724a4e0cd2077d3808795b9930e7be250e588cec500a6570949dde
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The document body text, though garbled, includes the phrase 'Best c v format for job' and the malicious URL, suggesting a lure to trick users into clicking. The presence of a large number of external PDF links further indicates a link farm, likely for SEO poisoning or to obscure the malicious redirector.

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=best+c+v+format+for+job
    • http://files.justbephotos.com/uploads/1/3/0/7/130775934/tamirotorun.pdf
    • http://movafin.flyinginfirst.com/uploads/1/3/0/9/130968988/tawimabofomolukek.pdf
    • http://gifanesur.bgbvi.com/uploads/1/3/1/3/131384401/sojobadonid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7824/6815/files/60242561635.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2315/files/budesonida_mas_formoterol_nombre_comercial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76685421079.pdf
    • https://cdn.shopify.com/s/files/1/0447/0875/7657/files/ganoximurujilulexek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6918/5943/files/functional_block_diagram_of_8085_microprocessor.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/65283003473.pdf
    • https://cdn.shopify.com/s/files/1/0434/8516/7766/files/64495569220.pdf
    • https://cdn.shopify.com/s/files/1/0447/6433/2181/files/download_breaking_dawn_part_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/7827/7527/files/78866601481.pdf
    • https://cdn.shopify.com/s/files/1/0437/5475/0106/files/96327057339.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66179678401.pdf
    • https://cdn.shopify.com/s/files/1/0438/5013/7760/files/76354834760.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/waxemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/bilepemulovevanowobizud.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007268.bin
cf777ea99e6a71c3cbbcd346dcca3d60878a43bc0be95258463e60a14de4672c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7268 5320 bytes
font_01_sfnt_off00008471.bin
dff67889c7ed18f75f4fba16d311f8289f0f5d994e334b1fec1b5f8d4cc4cbdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8471 9996 bytes

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