Malicious PDF — malware analysis report

Static analysis result for SHA-256 85987a3e23498193…

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 06:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3481c145b17fb5b05231d31adbfb01b9 SHA-1: d15328ff9e6dfd0c9b81e7f042402ae4bbd340f2 SHA-256: 85987a3e23498193ac9f8e80056bc6b352d881476909d3ede1fee9661e7c6954
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious content. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=bhola+hai+bhandari+song+ming
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/7786/7422/files/lidupuvajinadubonek.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/concierto_de_aranjuez_adagio_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0460/9749/8276/files/pro_evolution_soccer_2011.pdf
    • https://cdn.shopify.com/s/files/1/0428/3010/2694/files/payment_agreement_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/fepajewavefugiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/wajisabedovutunod.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/spanning_tree_protocol_router_alley.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/55365872144.pdf
    • https://cdn.shopify.com/s/files/1/0434/3051/0758/files/vikipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/koxizilikovomebemukovotuf.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_off000061ca.bin
c63186feb1d33148f29aa2ee983da11c0d514dee8a6166a34fe971acbaea31f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x61CA 5428 bytes
font_01_sfnt_off0000740e.bin
d379fd1e63d81d1b5b28721ccf37399ab7532f48bb096e85ae6ae33e393c9061
pdf-font-stream PDF embedded font (sfnt) at offset 0x740E 12936 bytes