Malicious PDF — malware analysis report

Static analysis result for SHA-256 757c63de963dc535…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 01:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 013f5ad615697d0c7e4452c4a1be4fb0 SHA-1: 7edea748d7aea1fe4e6260148ae8a2ac6213a6a7 SHA-256: 757c63de963dc535d8955660427768f6d80e7d45ccb37008a7fbefc1e22a6473
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to improve SEO, with one critical link identified as a malicious redirector. The document body contains obfuscated text and the target URL, suggesting an attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly indicate a malicious intent to redirect users.

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=equivalencias+benzodiacepinas+pdf
    • http://metajogi.communitycatcarecenter.com/uploads/1/3/0/8/130874330/sezojadatitav_fijopevubu_wamikowejuzukex_ditumerefutafe.pdf
    • http://files.deardahlia.net/uploads/1/3/2/6/132683000/c446f.pdf
    • http://files.mackatak.net/uploads/1/3/0/7/130740521/4093272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/wigotavagofomulivawuvexap.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/18722332260.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/28158074489.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/tobaliwekarokobixuzike.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/26420510035.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/minecraft_shrink_mod.pdf
    • https://cdn.shopify.com/s/files/1/0437/0553/2569/files/saxose.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76685421079.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/dasekonawoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/11778212132.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9560/files/the_bible_in_arabic_sidney_griffith.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/15491755960.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_off000063fc.bin
3574cee2a2faaeb963abacde65e84d7a68b0183a05b1e069a11379e38c19bfdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FC 5384 bytes
font_01_sfnt_off0000766f.bin
bd75001f0cfcf5cf6e5633df898fb0d3e399de5615145953d0ea9ca9f1bd4d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766F 10772 bytes

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