Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9b687290526e64…

MALICIOUS

PDF

42.7 KB Created: 2020-08-19 00:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5850981ea1a68c038865ca9c02c84c1 SHA-1: f6f7b164acd886f7f6bc50d078839bdb16b3a45b SHA-256: 7d9b687290526e646ecaa88f1051b2dd734bb73d757e282993fd29f7348ecbdd
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, characteristic of a link farm or SEO poisoning attempt. One of these URLs, 'https://ttraff.ru/pify?keyword=auto+tune+free++for+android', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links, including the malicious redirector, suggests an attempt to lure users to malicious sites or to manipulate search engine results.

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=auto+tune+free++for+android
    • http://sanorupo.nooracademyomaha.com/uploads/1/3/0/9/130969723/lizag.pdf
    • http://kegowar.mslacroix.ca/uploads/1/3/1/6/131636664/tabutulezobosi_vetowadovod.pdf
    • http://xeladavaz.gracebubeck.com/uploads/1/3/1/3/131384481/b1675fd.pdf
    • http://fedupeto.anewbeginningpreschool.com/uploads/1/3/2/8/132815367/nadubidabit.pdf
    • http://files.dapstempest.com/uploads/1/3/0/8/130874496/joxuwejojisiji-maxariripavo-kakad.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/rezofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/wopunujib.pdf
    • https://cdn.shopify.com/s/files/1/0440/8537/9237/files/carpal_tunnel_hand_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/71818649558.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/xbox_one_controller_button_layout.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/82293713048.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3382/files/google_drive_link_with_idm.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/3973477021.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/41415714783.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2960/files/78744110289.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/weruziwudenabejidomozaxad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7080/files/6448520167.pdf
    • https://cdn.shopify.com/s/files/1/0441/2515/9576/files/votavilizixizurokelider.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/marigolds_short_story.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_off00006b66.bin
309177bbb0588475ed9ddd9c3f767dfb0f6fff4478d440d7ca83fe757ebc33a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B66 4680 bytes
font_01_sfnt_off00007b60.bin
c99feb2edfb8e87c8c26f8ef7ccc54ec0af2ab6f21e3603bb017e48f0e91732f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B60 10104 bytes

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