Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e813648bf2e784…

MALICIOUS

PDF

53.6 KB Created: 2020-10-02 23:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e19f903d6412f196ad63ed98b9f15f2c SHA-1: 2842522edbdfaa1ac15b5f5bf9e56059b0f7301b SHA-256: 59e813648bf2e78494a4e06defea4b18ff4e2e7b49491fc2687259c4b54e0aab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URL is https://ggtraff.ru/strik?keyword=lalitha+sahasranama+pdf+telugu, which likely serves as a gateway to further malicious content. The ML classifier strongly supports the malicious verdict. The document body appears to be malformed or obfuscated, but the presence of the malicious URL within it reinforces the attack pattern.

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://ggtraff.ru/strik?keyword=lalitha+sahasranama+pdf+telugu
    • http://romabemo.monzuhannah.com/uploads/1/3/1/6/131636991/5573090.pdf
    • http://files.3bdesigns1.com/uploads/1/3/1/0/131070146/migitafivewuweda.pdf
    • http://files.cannycanines.com/uploads/1/3/0/7/130776446/nagevag_tununawekusuj_devatix_nozukajeb.pdf
    • http://files.starlightdancecamps.com/uploads/1/3/1/6/131606965/8b510a476b41.pdf
    • http://ninexaki.westchestercinemaclub.com/uploads/1/3/2/7/132740750/nasuwulubu-rivulim-norekuwaratis.pdf
    • http://files.kelownaquilts.com/uploads/1/3/1/6/131606262/kowarafutaguta_nunebo_kevojejeju.pdf
    • http://files.olphartz.com/uploads/1/3/2/6/132681502/gijawi.pdf
    • http://wenomen.neverstripaflooragain.com/uploads/1/3/0/7/130739086/1146b435a59be12.pdf
    • http://files.elliotgardner.com/uploads/1/3/0/7/130775679/niredovevifijamolu.pdf
    • http://lujakovos.huckleberryherbs.com/uploads/1/3/0/7/130775840/ninamekuredo.pdf
    • http://files.butgodministry.com/uploads/1/3/1/8/131857540/tofuzowadi.pdf
    • http://files.macsnapshot.com/uploads/1/3/1/4/131438190/8153082.pdf
    • https://cdn.shopify.com/s/files/1/0438/2231/7725/files/amazing_amendments_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0483/4780/7895/files/black_flag_t_shirt.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/substitute_for_gruyere_cheese_in_quiche.pdf
    • https://cdn.shopify.com/s/files/1/0481/4133/6739/files/56157105878.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a49.bin
453b9e974c8dad57ed0fd34e0697244143210b4d26641747fd88543daaaa7c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A49 5396 bytes
font_01_sfnt_off00009c7b.bin
329d023086c35b1c5408e4e28a0003028fac748254638bc0d4d79d4b683bbdae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7B 15928 bytes

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