Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f71d8896fd1ef0…

MALICIOUS

PDF

39.5 KB Created: 2020-08-20 02:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75146196facd25f06d9e0f1c2fb44edc SHA-1: e8b4d82b3f9eef9684c2df69d041d0984aff903d SHA-256: 03f71d8896fd1ef0f65f6e23377300649db139ff2382b08c957b8197c3c23a43
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to LSAT questions and a URL that is also present in the extracted URLs list. The primary malicious URL is https://ttraff.cc/pify?keyword=free+practice+lsat+questions+with+answers, which is likely used to redirect users to a malicious site. No scripts were extracted, but the PDF structure and embedded links indicate a phishing or redirection 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.cc/pify?keyword=free+practice+lsat+questions+with+answers
    • http://lizalal.rachelhenson.com/uploads/1/3/1/4/131453960/wimupibixozotet.pdf
    • http://files.thevolunteerclub.com/uploads/1/3/0/7/130740213/tamatitesipiwax.pdf
    • http://xuvenoxib.standrewsweb.com/uploads/1/3/1/0/131070722/tiwepotojuze.pdf
    • http://files.txheartlandins.com/uploads/1/3/0/9/130969148/72095b057f1e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/static_gk_capsule_2020_ibps_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/3077/9816/files/vawamipamuxizenavewolafuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1336/files/5372838315.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4396/files/11794048211.pdf
    • https://cdn.shopify.com/s/files/1/0436/0978/4482/files/57979232039.pdf
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/26217157337.pdf
    • https://cdn.shopify.com/s/files/1/0437/4603/3818/files/34081833673.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/13287952659.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/english_grammar_for_5th_class.pdf
    • https://cdn.shopify.com/s/files/1/0444/4710/5191/files/kekizigibovexitetetiwiw.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cec.bin
a361aba30fd00b81593a315d78ca1c6d7c1a27cf096e34de4ccc2ed6dc45d3ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEC 5192 bytes
font_01_sfnt_off00006ea3.bin
1be0d4e19ebacc9495d59a26d01536cadff2669e43f089add278883b687accd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA3 10128 bytes