Malicious PDF — malware analysis report

Static analysis result for SHA-256 7356fb15684b2ce1…

MALICIOUS

PDF

41.5 KB Created: 2020-09-07 13:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84493f5d649f5e7fa56bbc5b4508ce90 SHA-1: 6edce82e76512aadd10d87f38288782fe63f6f64 SHA-256: 7356fb15684b2ce10f91d3c571e0d21b85e4c2e6c09ec2f43a5d49e4d5bddb16
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including a primary redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains text related to job searching, suggesting a lure to a phishing or scam site. The presence of many external links points to a link farm or SEO poisoning attempt to drive traffic to malicious destinations.

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.me/wix?keyword=android+application+developer+jobs+in+hyderabad
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/9670/9022/files/idsa_cap_guidelines_pediatrics.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/office_2019_professional_plus_iso.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/gogujika.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6741/files/wefagijesugajufuwof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5329/files/52000784510.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad2c053ff0bc45418ff3f20fdb04f426.pdf
    • https://static.usrfiles.com/ugd/affaa6_68c5e01c38ad43c891a17833e4d560f9.pdf
    • https://static.usrfiles.com/ugd/fc840b_14cc1ea1dbc64a4a8da14f347d66b19a.pdf
    • https://cdn.shopify.com/s/files/1/0437/1513/3605/files/73397273196.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/31199073730.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/muzapodoxuzowej.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/77197068025.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/toefl_sample_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1812/4445/files/18136766872.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_off000054f2.bin
e3c7f0c911aa7cb160474c9eee4452323ae6542aa8a2107df3817ec7868dcab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54F2 5316 bytes
font_01_sfnt_off000066f8.bin
7bed636f3efa6ea6892c270b14df98c05b17511209cadd77b22841674e66e170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F8 10400 bytes
font_02_sfnt_off00008a56.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A56 4324 bytes

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