Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cb1d9f4c3c2c18…

MALICIOUS

PDF

39.1 KB Created: 2020-08-21 17:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 798ea94d906face86c6b78c568b141c0 SHA-1: 287f105d138099f2cbccda871665dc4eceb2ee1a SHA-256: 65cb1d9f4c3c2c18b5851c5830819585e8f10cb9f67e705de3d54fa5b10d7c1c
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to a malicious redirector, specifically 'https://ttraff.com/pify?keyword=darjeeling+tour+guide+video'. This technique is often used to obscure the final malicious destination and evade initial detection. The presence of numerous other PDF links, many hosted on Shopify, suggests an attempt to create a SEO-based link farm for malicious purposes. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=darjeeling+tour+guide+video
    • http://files.daltonhamiltonlightingdesign.com/uploads/1/3/0/9/130969434/86eb54f39d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/rmit_international_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/40133801247.pdf
    • https://cdn.shopify.com/s/files/1/0454/6284/7640/files/xojiguni.pdf
    • https://cdn.shopify.com/s/files/1/0435/6718/6079/files/marc_benioff_trailblazer.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7426/files/btec_level_3_national_sport_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/2443/9717/files/iowa_state_football_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/kevejaxoxagujadilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/dikuwosufek.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9107/files/dupexavaxokopipisipike.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/odisseia_homero.pdf
    • https://cdn.shopify.com/s/files/1/0437/2378/4360/files/equifax_credit_dispute_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/kuvusolerenavixaloga.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/english_speaking_test_questions.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004942.bin
d7fcbb882682f063be04b1f7a8334727238f1327b61bc0f29c047ec8e57d1d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4942 4948 bytes
font_01_sfnt_off00005a33.bin
8882713bfb73b90d9b231503df4a0f85cbc66edf3a1be2437b14cab63801b984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A33 9292 bytes
font_02_sfnt_off00007a35.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A35 16164 bytes

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