Malicious PDF — malware analysis report

Static analysis result for SHA-256 71209945fca9701b…

MALICIOUS

PDF

43.7 KB Created: 2020-08-14 09:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 603c58152ffc736e54d9555e272c05e5 SHA-1: 50c9e6b09b43221022d75fe0cd07ac307bceefae SHA-256: 71209945fca9701bcbe14302a9a4eb2443efddbdf6624e4da4db216bc99920f6
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains the same redirector URL and several other URLs that appear to be part of a link farm. The ML classifier also strongly indicated maliciousness. The primary attack vector is likely spearphishing attachment, with the embedded link serving as the lure.

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.cc/pify?keyword=hatchimals+colleggtibles+guide+season+2
    • http://gojob.rrecon.com/uploads/1/3/1/4/131482995/b75632b61d2.pdf
    • http://files.mckenziebible.com/uploads/1/3/1/0/131071117/5da85ccfd52ee.pdf
    • http://files.erinmerrill.studio/uploads/1/3/0/7/130739043/zikaxokelejim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/31075505860.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/management_principles_and_organisational_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tujekozovazufurujujazer.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/xisaru.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/mcgraw_hill_7th_grade_math_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/keyboard_and_mouse_skills.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/falemigomewijetal.pdf
    • https://cdn.shopify.com/s/files/1/0437/4711/5157/files/tevofuwelavemono.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7005/files/wopem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofes.pdf
    • https://cdn.shopify.com/s/files/1/0437/9167/9648/files/eu4_revolutionary_flags.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/20806635246.pdf
    • https://cdn.shopify.com/s/files/1/0435/2586/5636/files/borewusifarolodosiru.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_off00006c69.bin
ed3860844ce6dc2d58f3b7a670669eb4bbdf2bf4077dd493fc84da5873c8642a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C69 5492 bytes
font_01_sfnt_off00007eea.bin
d13f5a53c1185396b078918b67be5f19b9bf4d4cbbb81a2cb65e6f80b4bc642a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEA 10260 bytes

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