Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcf744092b713c6…

MALICIOUS

PDF

47.9 KB Created: 2020-08-19 02:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b030475daa556b3c6aa87405a670e0 SHA-1: b2a20a8b14162e62c518072b17faf640bae1ddd1 SHA-256: 7dcf744092b713c6e0c2ba90bbc2f120283dcaaf40e310f6e70ca30acbbe4421
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, 'https://ttraff.com/pify?keyword=clearance+sheet+music', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document body, though heavily obfuscated, contains the malicious redirector URL and several benign-looking Shopify URLs, likely intended to mask the malicious activity.

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.com/pify?keyword=clearance+sheet+music
    • http://files.ehsfluidpower.com/uploads/1/3/1/6/131607054/meloleno.pdf
    • http://files.naturehillsfarm.com/uploads/1/3/1/8/131871462/d11decb.pdf
    • http://files.mommyandmeadventures.net/uploads/1/3/1/3/131380895/9482696.pdf
    • http://files.lahabratamalefestival.org/uploads/1/3/1/8/131856005/jetulupidoku_luzigokurasibe_jokitovununewig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/gfta-_2_scoring_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/country_airport_codes.pdf
    • https://cdn.shopify.com/s/files/1/0435/6007/5427/files/makajuwevefosofojowovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/biwid.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/article_defini_indefini_partitif.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/59090606224.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/rasiruzoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/declaration_of_assets_and_liabilities_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/the_beebo_brinker_chronicles.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/5832/1821/files/apex_predator_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/aashto_1993.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5195/files/13977498027.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_off00006f62.bin
4534c700f625d1c209ecaf34c213832e58201ec1e72ab617c4af3f5a32f3982b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F62 4832 bytes
font_01_sfnt_off00007f92.bin
c477e3e283508a89a10b1d5ce536cb7ecb7b2d6e68332083faefc8e2bafba696		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F92 10732 bytes
font_02_sfnt_off0000a43a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA43A 4324 bytes

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