Malicious PDF — malware analysis report

Static analysis result for SHA-256 6773083d1fd9c5cf…

MALICIOUS

PDF

49.0 KB Created: 2020-08-20 00:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af81f98f18476554b28a200fd4ccf615 SHA-1: 1bcc3e297681531e8bbfc3c392152d296fb6f3a4 SHA-256: 6773083d1fd9c5cf171699efdd4111bc2b8e23604e45472a4ebface5e219a897
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a document related to construction excellence. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=achieving+excellence+in+construction+pdf
    • http://files.waianaeassemblyofgod.com/uploads/1/3/1/0/131070192/wasitumifazezux-jitewisoxib-mumisikex-zasusefobikivem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/jetaluruwabusuvesegizow.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/advanced_excel_topics.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/bharat_gas_connection_transfer_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/45318598540.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9646434013.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/adobe_captivate_prime_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2802/8312/files/43558910491.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/sogemubinazemutevo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9961/7448/files/71364506049.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/19577262495.pdf
    • https://cdn.shopify.com/s/files/1/0447/4375/3879/files/excel_vba_userform_border_color.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/pitch_perfect_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9241/8468/files/board_games_download.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_off00008359.bin
c20f4a7ae1346ab150dbddb84713c1fcb74ca87f565dc30952b99d1b6a500ba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8359 5324 bytes
font_01_sfnt_off00009574.bin
c3d8f04814d3c94c70f31ebb811320ee61a807f47f361cc0b7217e95ebf39574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9574 9860 bytes

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