Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a0125773c80c63…

MALICIOUS

PDF

46.9 KB Created: 2020-08-15 07:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea2a258f7498b1b42e1266844ee3644c SHA-1: fc8db31f734b08c4ce0ea23ca52f478442ad072d SHA-256: d9a0125773c80c63932512a4cd0eb3dd04876f7716f3cd33e7ca1cf1a29979f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, disguised as a free game download. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags this behavior. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains the target URL and a lure related to 'grand theft auto free game for android'.

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=grand+theft+auto+free+game+for+android
    • http://files.littlebundleandco.com/uploads/1/3/1/3/131398134/tujakomazosal_wuzivesut.pdf
    • http://files.elearningnexgen.com/uploads/1/3/1/0/131069898/7738120.pdf
    • http://files.offenhambells.com/uploads/1/3/0/9/130969855/watudevamumavijogaz.pdf
    • http://xunune.meghyncox.com/uploads/1/3/0/8/130814674/3190505.pdf
    • http://pumuve.clcsspecialeducation.org/uploads/1/3/1/3/131383314/f6dfe.pdf
    • http://files.littlebundleandco.com/uploads/1/3/1/3/1313981
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/falling_leaves.pdf
    • https://cdn.shopify.com/s/files/1/0433/3925/1870/files/renupenaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/98736094870.pdf
    • https://cdn.shopify.com/s/files/1/0449/7843/8302/files/mathematical_notation_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/folemifilidub.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/65106450838.pdf
    • https://cdn.shopify.com/s/files/1/0434/2310/5189/files/domozafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4734/files/87247409610.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0436/2171/2034/files/suzuki_king_quad_700.pdf
    • https://cdn.shopify.com/s/files/1/0443/7049/3596/files/basic_grammar_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/pepajubovamime.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bd1.bin
b4b36cf20505ffc6256e0af0f4b689fec30e05a9aec5ff48189101ef6dca268c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD1 5024 bytes
font_01_sfnt_off00007cb6.bin
d608405b2ed574a1af682afa90b6efd0139ae7b419ee664cab5e7f72542b6ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB6 10364 bytes
font_02_sfnt_off0000a02b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA02B 4324 bytes

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