Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f15563d9434c154…

MALICIOUS

PDF

41.0 KB Created: 2020-08-06 06:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 298813eb26afbc3f28207ca254bf9c1f SHA-1: ff75848cb44bbee7fa48f1b4b95930c0e1180545 SHA-256: 3f15563d9434c154c8882dbda546a91288f29fbfb82b151ccaa35f9f111d595e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting a lure to a malicious site disguised as a benign document. No scripts were extracted from this sample.

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/pify?keyword=narrative+data+analysis+pdf
    • http://files.fldkgef.org/uploads/1/3/0/7/130775306/zololavepetini-virakoka.pdf
    • http://files.matterbotattica.com/uploads/1/3/2/6/132681901/c586d0a7.pdf
    • http://files.wardahhannan.com/uploads/1/3/1/3/131384424/xorow-wasujezagaro-safozodoxuletuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/65878102346.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/jujejejageritodox.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/ccna_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4983/files/repusefalutabilaxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66264102559.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/28697932205.pdf
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/50355139035.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7283/files/arbitration_and_conciliation_act_1996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/possessive_case_exercises_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/69868444849.pdf
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/7672683989.pdf
    • https://cdn.shopify.com/s/files/1/0428/9334/4924/files/canadian_visa_application_form_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puwojadudabub.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_off0000624c.bin
9867e602955085c82f78f25f800d2c3ad04d8991006dab3165f76f69134ef5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624C 5164 bytes
font_01_sfnt_off00007405.bin
723a76ab32d53ec98b38986f20cb6b37dcf9df19dcc5bf34efdb1f164533f83d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7405 10284 bytes

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