Malicious PDF — malware analysis report

Static analysis result for SHA-256 67682d5a8274a087…

MALICIOUS

PDF

33.1 KB Created: 2020-08-24 22:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 243f8d5364cbd731c525b6f145dc348e SHA-1: b05c7dcc158470abb8ea95fb82b9e829306e5fa2 SHA-256: 67682d5a8274a087f1365165c546e7dd0e0a36f971f8347deed9bb2637bdca2e
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 redirector infrastructure or potentially malicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to direct users to harmful content. The ML classifier also strongly flagged this PDF as malicious. The document body, though obfuscated, contains URLs that align with the observed malicious linking behavior.

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/pify?keyword=barbie+princess+games++apk
    • http://nulefasu.enterhisgatescamp.com/uploads/1/3/1/4/131453718/wuworunoke.pdf
    • http://files.nonprofits.dk/uploads/1/3/1/3/131383297/bavowu.pdf
    • http://files.upstreamlearning.org/uploads/1/3/1/3/131381553/sivif.pdf
    • http://mupex.mcstorytellers.com/uploads/1/3/1/4/131405927/vomoderugasebegekaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3337/0529/files/xuvetima.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/year_end_report_card_comments.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/guitar_backing_tracks_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/56122501412.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/ejercicios_de_analogias_para_secundaria.pdf
    • https://cdn.shopify.com/s/files/1/0429/1556/1638/files/85108400156.pdf
    • https://cdn.shopify.com/s/files/1/0432/7810/6779/files/javascript_load_local_json_file.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/talani.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/43215696423.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/sopemekewegonemegokagovaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3259/files/21810792607.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_off000045c4.bin
cb05d487058b2615a5b7f7c87d01e72547ee2aac974a3073bb53443fbee7b97c
pdf-font-stream PDF embedded font (sfnt) at offset 0x45C4 5472 bytes
font_01_sfnt_off0000584e.bin
28e1c0a94e8d435fa4a68ed0b554e8bee0789c69780a0c8f5e83ef76267fde88
pdf-font-stream PDF embedded font (sfnt) at offset 0x584E 9232 bytes