Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bb9a529eb1bba4…

MALICIOUS

PDF

44.1 KB Created: 2020-08-30 12:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3e6c4d5bff4dbeddba44ec9b010ada SHA-1: d5142527e095ef2b31c96fb89e64101906daef09 SHA-256: 76bb9a529eb1bba423290193f389bd63dbfe1cead980ba04321334c573e34eac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.ru/wix?keyword=rubrica+para+evaluar+lectura+de+comprension
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1072/6815/files/cancer_de_garganta_por_vph.pdf
    • https://cdn.shopify.com/s/files/1/0432/4196/3679/files/convert_t_jpg_sang.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/ansar_battalion_job_circular_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/1726/3510/files/fate_apocrypha_vol_3.pdf
    • https://static.usrfiles.com/ugd/b8c837_7474e173042e48d09a9aaf84ad0c5dcb.pdf
    • https://static.usrfiles.com/ugd/b8c837_095ce45726754f1a80b4fad33e1d2669.pdf
    • https://static.usrfiles.com/ugd/b8c837_17a176ca866e4eb795c9ec8c5114e4cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5f882c6613d40fea5d074ba869034d0.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/nudopotupigazebenepiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/81703333446.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_off000069fa.bin
a768326d5aa3ae431c095990c6a909fbe771d07060b384df2356067999280221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FA 5428 bytes
font_01_sfnt_off00007c55.bin
7c25a2c7c9eb922be18f50551fa30cd6acaa468ad5a29b8bc85322d595eff2d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C55 11400 bytes

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