Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae8cb9165fbc58c…

MALICIOUS

PDF

45.1 KB Created: 2020-08-10 04:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de91104831e31d615219555ee0db075d SHA-1: ff58a099078e3c9ccd251c87062fd3d4a7fd9014 SHA-256: cae8cb9165fbc58cada726a523655fb8bb602650bfabd57503f9b6e1506057a0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure. The document body, though partially corrupted, contains text related to downloading Adobe Reader, suggesting a lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a malicious redirector, and PDF_SEO_LINK_FARM indicates a large number of outbound links designed to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=adobe+acrobat+pdf+reader+for+windows+7+free+download
    • http://xofowi.traveltoasiaandback.com/uploads/1/3/1/0/131071164/nefijobif.pdf
    • http://files.actingonfaith.org/uploads/1/3/0/7/130739906/1759211.pdf
    • http://files.thewrightograph.com/uploads/1/3/2/6/132683367/jemub_jenamaliv_sininopireliso.pdf
    • http://files.sarahlynncouture.com/uploads/1/3/0/8/130814717/4373872.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/tunogoveguvuvikapoforogax.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/panasonic_ag_ux180_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9490/7810/files/tofafegudo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/minecraft_mods_xbox_one.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/31606568754.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/canciones_infantiles_para_preescolar.pdf
    • https://cdn.shopify.com/s/files/1/0431/2694/7989/files/59538686782.pdf
    • https://cdn.shopify.com/s/files/1/0434/6193/5261/files/59174056445.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/nokafakabufijexadad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0439/5037/5070/files/wugix.pdf
    • https://cdn.shopify.com/s/files/1/0439/2960/0155/files/hoover_max_extract_dual_v_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/sakshi_epaper_today_telangana.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_off0000723a.bin
f5fdd3ad2680a9ac59454ce622af5166482d9b0fc8a8221f9bba15594fcb0bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 5448 bytes
font_01_sfnt_off000084e8.bin
c5eb3b54a8dd0e5d84714b060e8b51c135b1f29f42b6888b47c58bcdeb86d7e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E8 9944 bytes

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