Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3dbdb1eb3435ac…

MALICIOUS

PDF

48.3 KB Created: 2020-09-01 08:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e713ffe37335fc75d24e26115355d327 SHA-1: b52b089a3a737cee8be026fcb08754564986b1ff SHA-256: 8c3dbdb1eb3435ac44ebafe2159385a412b69c070e7fa2af4de2206a7720be72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, with one critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=complete+list+of+acids+pdf'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious redirector links and the overall structure point to a phishing or scam attempt.

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=complete+list+of+acids+pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a476d06f4149d8891dea33996ddab3.pdf
    • https://static.usrfiles.com/ugd/b8c837_f46e50aafd554ce7b0cb93f8a1dd3400.pdf
    • https://static.usrfiles.com/ugd/8b2c09_857d8988ed3a4f8eafb424c284fc8196.pdf
    • https://static.usrfiles.com/ugd/b8c837_117d75b6444e4070a4938bab2526fbed.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_26ee4f072f2449a5b4c75f93e80f45e8.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8102/files/can_i_get_pregnant_after_a_tubal_ligation_and_endometrial_ablation.pdf
    • https://cdn.shopify.com/s/files/1/0436/8039/9513/files/vokokakufekila.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/lubusopijakalixeveg.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/nolosudebawajirovumode.pdf
    • https://cdn.shopify.com/s/files/1/0432/5077/8275/files/zawaxobowizedanovow.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/acetilcolina_farmaco.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/lenovo_thinkcentre_graphics_card_upgrade.pdf
    • https://static.usrfiles.com/ugd/d54300_cd8e7bab815e410fa38f5bd581e26961.pdf
    • https://static.usrfiles.com/ugd/1be480_37ff825986df407898f24925056cda8e.pdf
    • https://static.usrfiles.com/ugd/b48b60_d9a6d655ccda4bfda5a743328033cf1b.pdf
    • https://static.usrfiles.com/ugd/12dc78_4711f2054d78451287c2f34e58ee3c40.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a3e.bin
073532bc2cd879e56446c2a5a27ff23786fa3176b154bf08a211e6d4011e9afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3E 5108 bytes
font_01_sfnt_off00007b89.bin
2fdcd1555302635a227f1f14cafd3cb91594b3a7044178e0d795994fded1efdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B89 10624 bytes
font_02_sfnt_off00009f0a.bin
9bff4e6d7f8cbe2dc7292347b18f75d0d8e6bccc0e080da3143d66f69ef3d0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0A 16116 bytes

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