Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f81ac29bed1e824…

MALICIOUS

PDF

40.6 KB Created: 2020-08-06 09:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a2b1bc0a526e15f507d8a0c2e30067 SHA-1: 486ab5cc7e64511ade7fab2f8559b23e916607d2 SHA-256: 2f81ac29bed1e8242f31718ed7d7f9f62b7c50294ba4df513029bd002f17e851
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous Shopify-hosted PDF links suggests an attempt to appear legitimate while masking the primary malicious intent.

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=list+of+philippine+accounting+standards+pdf
    • http://files.blackperiodinc.com/uploads/1/3/0/7/130776265/wexalemoxi.pdf
    • http://files.sugarellasweets.com/uploads/1/3/1/4/131482886/f10e11160e0.pdf
    • http://files.essexgardenclubct.org/uploads/1/3/2/6/132681647/11ab24a1b11d52d.pdf
    • http://files.pdsstartalk.com/uploads/1/3/1/1/131164351/didebipojebufe_nazen_dotesiko_voloduti.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/banking_and_financial_services_act_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/53150519984.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64238793182.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/tifojitutijo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/34988921231.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/kiromukupetineju.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/palladium_rpg.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/rental_agreement_contract.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1364/files/95093873471.pdf
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/borubumaxajuxupuwuwor.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/47410900869.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_off00006111.bin
b80711f32bbe102a3e404ee753137050d1ae0638f3d19f5a0b1d605a02cdce11
pdf-font-stream PDF embedded font (sfnt) at offset 0x6111 5360 bytes
font_01_sfnt_off0000734a.bin
e328809daaf97a2949853dc234c5118e5822d6e2d60888fe7b23ac2dc0d708dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x734A 10040 bytes