Malicious PDF — malware analysis report

Static analysis result for SHA-256 11636ba6b4abe7eb…

MALICIOUS

PDF

39.2 KB Created: 2020-09-04 15:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80ab029c903b336bf14bcf1e93442087 SHA-1: 12ceaaf3fd41eaecdbc1adcc5b900ede72583d74 SHA-256: 11636ba6b4abe7ebf94cc629c2b3cdf62aaa88e0282ad18e9cc97ffbbd43cc8d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.me'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but serve to obscure the malicious one. The document body, though heavily obfuscated, also contains the malicious URL, suggesting an attempt to lure the user to a potentially harmful site for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.me/wix?keyword=ihss+san+francisco+timesheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_3492c2fbcba04b1ba83ca38d1a768305.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc382d467c754a869cd3d621bcb08ec2.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_75c9f29d4d28428bafd1f7d2246ead47.pdf
    • https://cdn.shopify.com/s/files/1/0439/0970/9976/files/lawevulubowazotaxerufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/rurokinad.pdf
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/49994482890.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5250/files/76049982193.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4678/files/9460995794.pdf
    • https://cdn.shopify.com/s/files/1/0438/3794/8061/files/probability_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0438/8179/1643/files/97440164967.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/bacterial_cell_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0457/4422/6460/files/netflix_movies_to_watch_offline_ipad.pdf
    • https://static.usrfiles.com/ugd/911c12_5e0005c8ba9f45a99c89fd62318af979.pdf
    • https://static.usrfiles.com/ugd/db1da1_e61f9edbe9774ea9b2ee320b78588b0a.pdf
    • https://static.usrfiles.com/ugd/7e6083_a84ccd37448e4711805ed16ad2c97a11.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f496e21c71f4133bbef8f40766c2897.pdf
    • https://static.usrfiles.com/ugd/fa32a6_20828c0dab3c4bbe9210ea74f3010ac7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005180.bin
8f6b66f2d3c9ca996ff87e40f33597e9c5c74b8385f5a1716ed9de3537cee889		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5180 2984 bytes
font_01_sfnt_off00005c30.bin
1b622e19272e904b078e8e9701b39df289657b281e8af430910a8ed74cd612ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C30 5024 bytes
font_02_sfnt_off00006d1e.bin
a6217e1262bc3f23cf39839e28e9869762629fb8611c4492b013d10dac48770a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 10044 bytes

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