Malicious PDF — malware analysis report

Static analysis result for SHA-256 350c83ea4013d41c…

MALICIOUS

PDF

46.9 KB Created: 2020-08-13 13:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3352c6dec82815a11802da4282f48d0d SHA-1: 5364615146eede1bb458c080ab8c5facbec3e10e SHA-256: 350c83ea4013d41c14cfa21815a8e864894bf5678ee3ad9ce5563e2deb98c8da
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a 'pre-lit christmas tree instruction manual'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body text, though heavily obfuscated, contains the same lure text and URLs, reinforcing the social engineering aspect. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute the malicious content.

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/wb?keyword=pre-lit%20christmas%20tree%20instruction%20manual
    • http://files.thewhiteorchiddayspa.com/uploads/1/3/1/4/131484029/9017116.pdf
    • http://files.biofxn.com/uploads/1/3/0/7/130740323/6952898.pdf
    • http://files.acsnutritionfitness.com.au/uploads/1/3/1/3/131379615/pidirudoxutal_fidivegedewiwo_bijesagoxid_fanowago.pdf
    • http://xuwiv.maggiezlatanova.com/uploads/1/3/1/3/131378814/vijixanixuwexe_sovajosegi_nasabaji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/77617944965.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/43895561665.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/nukapepevotusoxuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5214/5560/files/xifupojaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/9689/7704/files/valujuxumabegaxojewizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/nubenik.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/fujukajeja.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/9054141409.pdf
    • https://cdn.shopify.com/s/files/1/0433/3607/3366/files/54537275556.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/79343983548.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/48921887963.pdf
    • https://cdn.shopify.com/s/files/1/0431/1334/9273/files/papefileti.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1823/files/download_buku_creative_writing.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_off00007a0b.bin
de33b51441d9281604afee9bfce0b4364f7b312ffa702913ef96f90e5ebb5a58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0B 5072 bytes
font_01_sfnt_off00008b21.bin
4112291b131420534a0bf79362d35bb215f4a137a07a1031329d42198d7f4f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B21 10392 bytes

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