Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9466ccf9e886091…

MALICIOUS

PDF

36.4 KB Created: 2020-08-30 21:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e40945bd1537784e6874e726699cd038 SHA-1: a189dbb78316c25530a5cf21c5e8a477cdf830b9 SHA-256: f9466ccf9e886091301b75056b809dfeeef0c99d9cd585745ace60311725985b
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to the presence of a link farm containing numerous external links, with one identified as a malicious redirector. The primary malicious URL, 'https://ttraff.ru/wix?keyword=weider+pro+4250+price', is a critical indicator. The document body, though heavily obfuscated, contains this malicious URL, suggesting its purpose is to lure users to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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=weider+pro+4250+price
    • https://static.usrfiles.com/ugd/d7ba0f_efedd570bbca44cf95a7d180d9042e12.pdf
    • https://static.usrfiles.com/ugd/b8c837_2178fc3e576e45d3806a5c0956ce27b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8543f49da794d3c97b79c8ee397ac57.pdf
    • https://static.usrfiles.com/ugd/b85eb0_51319eb41ff7493690ba358ec1125bf4.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_c598a65dfbc94c82b7a6ff423c5c5d7c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/sutimawarib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/bios_instant_notes_in_biochemistry_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/0905/4619/files/78362990265.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8223/files/42404900251.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/best_screen_dimming_app_android.pdf
    • https://static.usrfiles.com/ugd/c1615c_f90bacb8fd3c445c976f49f7b8cf9b44.pdf
    • https://static.usrfiles.com/ugd/b8c837_d31d2ca7403044f786081ee576260a64.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e1408ef79ab4955b5c925b23b367cb1.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/zovabiribefifilunod.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/43387570860.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/zezowijoxilozoki.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/factorio_pipe_throughput.pdf
    • https://cdn.shopify.com/s/files/1/0434/5026/9849/files/liverpool_salzburg_match_report.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_off00004f71.bin
77555325ff9d6a68acaa661ba96965adfbe4cbadf2fc640ead7d1db860450b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F71 5148 bytes
font_01_sfnt_off00006119.bin
0baff0386acc6509dc01b3ceaa29b89eeb9c5c6d058f421a8c329de68ab0e7f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6119 10456 bytes

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