Malicious PDF — malware analysis report

Static analysis result for SHA-256 7540bbf22d9583a7…

MALICIOUS

PDF

52.4 KB Created: 2020-08-31 19:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08a5804274eb830639d6c799bebcad97 SHA-1: 42ce49f37e2db784a95b429e62d1ab6c00a99324 SHA-256: 7540bbf22d9583a7e13c05ce52b779a4c1ae7f2b41c90beb3142c0b73cb750e2
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=android+mobile+update+app, suggesting a lure for users to download a fake Android application. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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/pify?keyword=android+mobile+update+app
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/6347/4331/files/96333773311.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/34033471919.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/doreruni.pdf
    • https://cdn.shopify.com/s/files/1/0431/0099/5741/files/36248612954.pdf
    • https://cdn.shopify.com/s/files/1/0438/8601/8712/files/43963239689.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/vapeziwegupawokewewekitop.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/manual_bienestar_animal.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2406/files/ferekazurigimog.pdf
    • https://cdn.shopify.com/s/files/1/0438/1048/8477/files/importance_of_symbolic_interactionism.pdf
    • https://static.usrfiles.com/ugd/cb5dea_a609ebbac3c8495ca02ce7e502c902cc.pdf
    • https://static.usrfiles.com/ugd/374ce0_5e4e7e47ec464afc9efbcf2a7971e188.pdf
    • https://static.usrfiles.com/ugd/b8c837_66e615173dc842f485a4b6990aa8b426.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c723ba9a3f5462caa9481fd5195fafa.pdf
    • https://static.usrfiles.com/ugd/b8c837_6284f60432dc49c2a809a8035327b542.pdf
    • https://cdn.shopify.com/s/files/1/0438/8261/0843/files/what_is_static_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5347/files/25501397573.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/wejosawed.pdf
    • https://cdn.shopify.com/s/files/1/0429/2204/9695/files/dapezebodubesijuxi.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_off00007edd.bin
19b6dcbef0973df32367c93c839d4ef4fed066e4a2fea16b536c0683c969355f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDD 4940 bytes
font_01_sfnt_off00008f7a.bin
116ede7582dbed38e509dbc42dbe70d77c89d8f54f7108d3b529ab705d4ff55d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7A 11640 bytes
font_02_sfnt_off0000b635.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB635 4324 bytes

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