Malicious PDF — malware analysis report

Static analysis result for SHA-256 59abc9e9c2c27b21…

MALICIOUS

PDF

51.8 KB Created: 2020-08-10 06:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fc1cab797587b0e1c3e2c1fc15b229b SHA-1: 2c85847562989076142b9dcb9b0cf7986bdfae8d SHA-256: 59abc9e9c2c27b21e357a42fdad2994067705a54582e14e9fff91addcbdb80a8
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers this heuristic. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to attract victims. 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.com/pify?keyword=cost+volume+profit+analysis+break+even+analysis+pdf
    • http://files.kfxfarms.com/uploads/1/3/1/3/131379443/womaka_lebapenojeni_kovulirelobe.pdf
    • http://files.mobileservicepros.net/uploads/1/3/2/6/132681479/8132827.pdf
    • http://files.useyourbodywell.co.uk/uploads/1/3/1/3/131380889/pojotepa-benubiru-dijeker.pdf
    • http://files.fd81.net/uploads/1/3/1/6/131607467/puxexufew.pdf
    • http://files.cupfestfairs.com/uploads/1/3/0/7/130739971/4601201.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/zirodimolubaxorozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/sapejoroleneb.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/justification_by_faith_alone.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/togidupezututukavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/neweloziwasupi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/xufipomosedolajesi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9387/7145/files/caring_for_rabbits.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/novoxewagawalopizijurur.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/architectural_drafting_and_design_donald_hepler.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/free_auto_repair_invoice_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5032/files/72050614621.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/89827206112.pdf
    • https://cdn.shopify.com/s/files/1/0432/6155/8944/files/zuwowol.pdf
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/lamegipomafuko.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_off000089af.bin
6585391ef6c348a3a135abdf3d027e0a0cf5c83ae716a22385bd9515cb29e5eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89AF 5456 bytes
font_01_sfnt_off00009c2b.bin
7b3179bc556cc6a5de89afb6930a16fdebdde38a10bf674a127d7ec4edbada9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C2B 10952 bytes

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