Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b969e1f490fafd4…

MALICIOUS

PDF

46.5 KB Created: 2020-08-27 18:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a05b6a41720e797fd307b6fede4a91b9 SHA-1: ee7405c9ae4f651f291ebca6133befafbafaf06c SHA-256: 7b969e1f490fafd4cff2c671b710419f583b9a90032aa96d4787de33a17b2945
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The presence of a large number of external PDF links further indicates a link farm strategy, likely to obscure the malicious destination.

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.com/pify?keyword=illustrated+microsoft+office+365
    • http://linoz.sunbearpress.com/uploads/1/3/1/3/131380349/sejomaluzup.pdf
    • http://files.thekeywithlt.com/uploads/1/3/0/7/130774990/kikebokumiw.pdf
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/basic_english_grammar_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/arquitectura_barroca_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/salanopadod.pdf
    • https://cdn.shopify.com/s/files/1/0431/7790/2234/files/kikovoduzev.pdf
    • https://cdn.shopify.com/s/files/1/0429/1310/4028/files/aryabhata_biography.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/davunaxejapezuxipuwuwozom.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3162/files/dovaxozagosapiwusimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/76872103536.pdf
    • https://cdn.shopify.com/s/files/1/0440/8734/5304/files/bojegatemozekusezakir.pdf
    • https://cdn.shopify.com/s/files/1/0462/4479/0426/files/cateter_venoso_central_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/ziposopusuririnefatowali.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.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_off000076b6.bin
4c66f477441855372561fe58db1ecaf8412115e2dfdc3430580b7310c643e6c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B6 5544 bytes
font_01_sfnt_off0000896b.bin
517564157581c8aba761a85b7cd42b691608abfc255b0f03ed742030d27fb6be
pdf-font-stream PDF embedded font (sfnt) at offset 0x896B 10320 bytes