Malicious PDF — malware analysis report

Static analysis result for SHA-256 7760e636b99984b1…

MALICIOUS

PDF

56.1 KB Created: 2020-09-04 23:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a8970ee604a1effe50fdd5ce8007c61 SHA-1: 54f39a13e6abe031d50bffe7f5c4e7cfc7451a6a SHA-256: 7760e636b99984b1509bf41ce88ac5c9fb51c2b3ffb44f874eddcf914030d053
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are part of a link farm, and one critical link points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for "Infosys written test papers", suggesting a phishing or social engineering attempt. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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.link/wix?keyword=infosys+written+test+papers
    • https://www.gamblingid.com/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0461/4488/0803/files/nimunonopobidefaketizes.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4817/files/81620275211.pdf
    • https://cdn.shopify.com/s/files/1/0433/1733/0075/files/xedizojazarefibevitotop.pdf
    • https://cdn.shopify.com/s/files/1/0428/7873/0403/files/troy_bilt_wood_chipper.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/lateral_thinking_puzzles_paul_sloane.pdf
    • https://static.usrfiles.com/ugd/ee4a13_03b41146ec484310b4693a3b30ba066c.pdf
    • https://static.usrfiles.com/ugd/bc84a3_873d5160c3014b9192e1328a1febd315.pdf
    • https://cdn.shopify.com/s/files/1/0436/6427/7657/files/45304417106.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/jibaguwel.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/17014833392.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/64048546764.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/42633179529.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/bridge_constructor_stunts_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/poruloti.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/altostratus_facts_and_information.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_off0000915a.bin
6875e30c6c9c3e3a36fdd8817ee050332b65fbe5ea0d15c08b601878ac9c873f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915A 4780 bytes
font_01_sfnt_off0000a1b3.bin
c9a1393e8f057af473b32d37597b68669a3a1b054a5b217f844031c859a3d529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B3 10572 bytes
font_02_sfnt_off0000c599.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 4324 bytes

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