Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b11771638b13574…

MALICIOUS

PDF

46.4 KB Created: 2020-08-07 22:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a011b87c23a88a8edd85c7f39fecfacf SHA-1: 2aa34ebbf9bd81ff276fd3731a47ef7081817c63 SHA-256: 0b11771638b1357404121ac8581e1bb629aa9a16c6d8a446e8a5b2548715c052
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 external PDF files, suggesting a link farm or SEO abuse tactic. One prominent link, 'https://ttraff.ru/pify?keyword=biography+of+great+leaders+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to malicious infrastructure under the guise of providing a PDF document.

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=biography+of+great+leaders+pdf
    • http://files.asomsanghacanada.org/uploads/1/3/1/3/131397987/fe8320.pdf
    • http://files.dzaka1908.com/uploads/1/3/1/8/131856860/soworekal_felotosuv_ferudizasot_sapojidero.pdf
    • http://files.ladymarigold.com/uploads/1/3/0/7/130775840/3585032.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/15468126453.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/cinema_4d_r20_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/rugobotiwinemaripu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/44191716165.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/3841159778.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/27886015417.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3799/files/cambodian_history.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gojifazuxosupimuron.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/65304756448.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7711/files/xebogulogikozivevupoluj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8206/files/free_steam_keys.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/mamuxonazitozufuxidovute.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ad9.bin
ba76e354889f060c8db95da3dc24a91b45d88bc102f1c17fd21479c56dad099e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD9 5136 bytes
font_01_sfnt_off00007c6e.bin
aa377c00a960e155fb80f798ea459719006692693ef4b5b3dbde74daf938145a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6E 10048 bytes
font_02_sfnt_off00009ed5.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED5 4324 bytes

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