Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a457c5349faa1c4…

MALICIOUS

PDF

45.0 KB Created: 2020-08-08 01:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edf365d0567302036d28060020f17c99 SHA-1: b12befbec5cfa73a96bb62204fbd913cd263c643 SHA-256: 6a457c5349faa1c4c2cad422ffdba890a6ad87944f64945abda5ddee403161ee
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 'https://ttraff.ru/pify?keyword=new+buffettology+pdf'. It also exhibits a PDF_SEO_LINK_FARM behavior, embedding 17 external PDF links, many of which are benign Shopify URLs but at least one points to the malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users to click on the embedded links.

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=new+buffettology+pdf
    • http://files.bethsecristbabywearing.com/uploads/1/3/0/8/130874559/ruramurufinigo-wuxiwuvade-sebagun-vakagasetep.pdf
    • http://xifeb.dokartistspace.org/uploads/1/3/0/7/130775934/guvetozonuko-pewuruwu-jigosinal-genem.pdf
    • http://files.newmtmoriahamejax.org/uploads/1/3/0/7/130776295/3055740.pdf
    • http://files.autumnselover.com/uploads/1/3/1/8/131856318/613692.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0681/9477/files/23223256624.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/electronics_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/0971/9965/files/vufikene.pdf
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/android_apps_making_tutorial_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/savoliwowi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5181/7883/files/bumaloz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/jimewikulukemupuja.pdf
    • https://cdn.shopify.com/s/files/1/0448/0519/3885/files/general_prologue_to_canterbury_tales_introduction.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/19813879759.pdf
    • https://cdn.shopify.com/s/files/1/0432/6106/7428/files/49001153860.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/pipepem.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/destiny_2_leviathan_underbelly.pdf
    • https://cdn.shopify.com/s/files/1/0440/3901/2502/files/mips_for_loop.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_off0000650d.bin
5934faa8f4e0914ed25ba9c4e204fb9b9e650cedfca26425fe6d3c10fc6349b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650D 4756 bytes
font_01_sfnt_off0000756b.bin
c79daa36139bc457fc96bd589040a7f7661251a7505a3b249d36beabf8a85c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756B 10316 bytes
font_02_sfnt_off000098a5.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A5 4324 bytes

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