Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad58c9f0841f68b…

MALICIOUS

PDF

39.8 KB Created: 2020-08-22 04:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ddbe87e4d460f4d9f3e5b5c5b459a77 SHA-1: a1ada30af3a8b2abbaa61f7ee8030e7c99ecb241 SHA-256: 6ad58c9f0841f68b4a888e7a99dddd88d04a831a3e761161a3b970a05dc72fd8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, likely intended to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, supporting the attack pattern of luring users to potentially harmful content.

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=android+animated+svg+view
    • http://padurotut.incubator143.org/uploads/1/3/1/3/131379394/4068087.pdf
    • http://files.jayepstein.org/uploads/1/3/2/3/132302871/a4d609572.pdf
    • http://kuzewel.tacticalmitigation.com/uploads/1/3/1/3/131383708/viwemez.pdf
    • http://files.287ranchsupply.com/uploads/1/3/0/7/130776142/lajogewapev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1664/9890/files/prime_time_6th_grade_math_book_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3071/files/32821613595.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/mirodot.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/72232117786.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/mitosis_and_meiosis_color_by_number_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/1851/8681/files/titamazapadinujet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/fun_general_knowledge_quiz_2018_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/5733/2895/files/decomposition_of_cellulose_by_microorganisms.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/asus_rtn66u_firmware.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_off00005440.bin
171b51f8d9f21fa7fde50af8d1a67deb335ee8514392656f4a374d8eeac791a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5440 5256 bytes
font_01_sfnt_off0000661a.bin
5dde79e3236d7fbcab5e4ba3f34d431334cc1f0fb702524fb4f6d5338e77d571
pdf-font-stream PDF embedded font (sfnt) at offset 0x661A 14068 bytes