Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd209c50f2ae4d6…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 23:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4ddaf3df35398529aeeb892ae0a0ded SHA-1: 6570b8cbdfec124b9af452317ad6921935dacc17 SHA-256: 9dd209c50f2ae4d6b6fbf4f51af38772ed2d16a8ac4da77b6f829ac529050cd4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.club', which is used in a lure for 'Steam for macbook'. This indicates a phishing attempt to redirect users to malicious content. The PDF also contains a link farm, suggesting it's part of a larger SEO poisoning campaign to attract victims. The ML classifier strongly supports the malicious nature of this PDF.

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.club/pify?keyword=steam+for+macbook
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/assignment_first_page_design.pdf
    • https://cdn.shopify.com/s/files/1/0437/2326/0058/files/adulteration_of_crude_drugs_and_their_detection.pdf
    • https://cdn.shopify.com/s/files/1/0444/1374/7367/files/hiren_boot_usb_iso_full.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ff32f78a12449649dd687e530b692e7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.pdf
    • https://cdn.shopify.com/s/files/1/0446/9918/9402/files/aceptarse_a_uno_mismo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/vocal_remover_apk_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/17181021178.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/evaluation_sur_napoleon_bonaparte_4e.pdf
    • https://static.usrfiles.com/ugd/aff7ca_1c57e7219b9043d7b26e64b8d0f5bf90.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad930f9d705b458d8c3e80af9d8e9ac8.pdf
    • https://static.usrfiles.com/ugd/8c0e65_e7ab9dfa31ff43b18631ef2d5dbe6ed3.pdf
    • https://static.usrfiles.com/ugd/5ecadc_175d71d7e1e94b96ad1a2ccfa5593a0b.pdf
    • https://static.usrfiles.com/ugd/3bf302_292d29bc73d944a7890ccbff5581e50a.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/
    • https://static.usrfiles.com/ugd/aff7ca_1c57e7219b9043d7b

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ff.bin
dd95767ae5d57a4103f803d109e6e0b7f1576ad95eb4d8c311629fd278c90e85
pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 5124 bytes
font_01_sfnt_off00007560.bin
50ba7716a32795fc772007dbcacf412c6967c441158da1b5b6ddbfc73da8ff8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7560 10360 bytes