Malicious PDF — malware analysis report

Static analysis result for SHA-256 087b2229fb6b5574…

MALICIOUS

PDF

40.8 KB Created: 2020-08-24 21:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e88f48ea8b1c1fc672faa51ec9dd02a9 SHA-1: ecfea4e3a593454c413cd11fd8feed6bce2902e6 SHA-256: 087b2229fb6b55743b1f9cb942036dfed224503a49eb54dd8b8514ada32c4b25
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, and one critical link redirects to known malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The primary attack vector appears to be directing users to malicious sites through a deceptive document.

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/pify?keyword=ballade+pour+adeline+piano+sheet+beginner
    • http://files.mwmbg.org/uploads/1/3/0/8/130814258/7ccf8f83d9e28b.pdf
    • http://files.scottrobesoncustomwood.com/uploads/1/3/1/8/131872238/xolunelefigasif_gowunenovujif.pdf
    • http://topemaru.cedarkeycommunitygarden.org/uploads/1/3/0/8/130874388/450300.pdf
    • http://vutuba.royalmarineser.com/uploads/1/3/1/8/131871787/zamazarasa.pdf
    • http://kazif.ftjbymelissa.com/uploads/1/3/0/7/130776542/803e7589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/kesovemupizakadolidi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1607/files/40480549091.pdf
    • https://cdn.shopify.com/s/files/1/0429/1906/7815/files/dirurubeta.pdf
    • https://cdn.shopify.com/s/files/1/0430/0836/0611/files/trader_vic_s_bartender_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7555/0876/files/wogapijejalovovutowev.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/certyfikat_kompetencji_zawodowych_ksika_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/25129189997.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/tazukum.pdf
    • https://cdn.shopify.com/s/files/1/0438/4276/4962/files/indore_master_plan_map_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/us_lottery_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/8645/3663/files/snes_co_op_games.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/luwememuziki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/jusalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/brick_bonding.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/helen_of_troy_movie_parents_guide.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_off00005d60.bin
a736b89307be02829d99c41ca344e0abf294f8b0f0331f22e9f269d9c1ad3ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D60 5408 bytes
font_01_sfnt_off00006fae.bin
daafa2cb31236a907604e45d388e0ca2b72ea4554a3255331161c591e81e0e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAE 13048 bytes

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