Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f0f5052948f05e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-08 09:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27446e4f0add7cee564520a97cf9797a SHA-1: 646ec35e0465096d31466f7cedb4a238e498d541 SHA-256: e2f0f5052948f05e71bee255d2574a59c05dda862036cddfddbfdc6580affa39
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'catechism online pdf' and includes the malicious URL. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious content.

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=catechism+online+pdf
    • http://bubabo.miniopener.com/uploads/1/3/1/4/131453494/devuxamiv.pdf
    • http://files.chromecomputers.net/uploads/1/3/1/3/131398333/fba53.pdf
    • http://files.johnpielli.com/uploads/1/3/2/6/132683228/waxijivuvofelox.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/kibadurenadeburoxaripedax.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/55314362783.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/bacillus_thuringiensis_plagas_que_controla.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/sparc_mac_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0437/7228/0981/files/revoxelizarelilimufo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4527/files/red_devil_broadcast_spreader_settings.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/pun_in_poems.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/5937896261.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/pizemosizegusuxesanorubij.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/nolewasagovosesibulexuwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7930/3317/files/english_grammar_in_bengali_language_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4736/files/dirifolurativosebe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rixaraxamixenapo.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_off00006128.bin
f5d59b4cc91e9db882b556f2a45d8c2ac2b39595d42d414970d72b147fe52d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6128 5204 bytes
font_01_sfnt_off000072b4.bin
1e1fc985cd18ebee07e260a30c606a5b786c9ee6e5b028447d008e837e24c92d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B4 10144 bytes

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