Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9a7a0f0ffe4ff5…

MALICIOUS

PDF

46.8 KB Created: 2020-08-31 06:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ea68711ab81c4f1865e13b3b1db95d0 SHA-1: 94f2feb2dfa58268152c31b7453140f199eb5a5a SHA-256: 7b9a7a0f0ffe4ff59e1ade10b25242febeb336bed49e7429f5c70661587aa610
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 pointing to external PDFs, which is indicative of a link farm. One of the primary links, 'https://ttraff.ru/wix?keyword=canto+exaltai+bendizei', is flagged as a malicious redirector. The presence of numerous links suggests an attempt to manipulate search engine results or distribute malicious content through a network of documents.

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/wix?keyword=canto+exaltai+bendizei
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4117a9_f54e1a857a9a4f69943c0ea1950acfdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_244c20871d254709ae39f38d64059956.pdf
    • https://static.usrfiles.com/ugd/9904c2_437a65e2135d465983a125af2d9e090a.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_d060e2acbad34d43b4f0ba336bdcef56.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_dcb68fbf19a540e8859eb73153bf9dbc.pdf
    • https://static.usrfiles.com/ugd/0b46e6_54f7b18148104679b1582d9da72646a9.pdf
    • https://static.usrfiles.com/ugd/590778_4b333e011d8d4a26b5d96c4b7df13d80.pdf
    • https://static.usrfiles.com/ugd/f8de3e_f8b654db4e984e1f9a7b2f0baef9a750.pdf
    • https://cdn.shopify.com/s/files/1/0438/8965/5960/files/febaxokefotujenofob.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/judutewisano.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/28257722120.pdf
    • https://cdn.shopify.com/s/files/1/0435/7845/8275/files/4868592787.pdf
    • https://cdn.shopify.com/s/files/1/0433/9132/0214/files/how_to_change_reticle_in_pubg.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/sebiraserowikojedomo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/administrative_management_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/4424891989.pdf
    • https://cdn.shopify.com/s/files/1/0436/7928/5401/files/78084117822.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/accounts_payable_process_steps.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_off0000713e.bin
a727b9fb5350014f14108f6c784654f8c621fccccd765ae660efcc08f81d148b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713E 4708 bytes
font_01_sfnt_off00008156.bin
d56b20bb64cc38b1a0b1d719e33cdac9db7f68f8c4090f04c54297491c583793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8156 14576 bytes

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