Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a4e9f6f9ef6862…

MALICIOUS

PDF

49.7 KB Created: 2020-08-18 16:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35d4d992dcf9299bbbd9eea4cdd68a7d SHA-1: 5fe8d9afa341823b7526b9a48e025926602555e7 SHA-256: a4a4e9f6f9ef6862f9e437404ac66d9b39cb992d1f52c8bc5060816129a299fa
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to ttraff.ru, indicating a phishing or malicious content delivery attempt. The document body, though heavily obfuscated, contains the same redirector URL and references an Australian rules football playoff format, suggesting a lure. The presence of a large number of external PDF links further supports the classification as a link farm, likely intended to distribute malicious content or engage in SEO poisoning.

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.ru/pify?keyword=australian+rules+football+playoff+format
    • http://files.chadlutzke.com/uploads/1/3/1/6/131637137/3342743.pdf
    • http://bubejop.resoundingword.org/uploads/1/3/2/7/132712416/4122779.pdf
    • http://files.gbforussenate.net/uploads/1/3/1/3/131380591/mavomuguwavudu-zakajulerapoge-mukijofebejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/79560277582.pdf
    • https://cdn.shopify.com/s/files/1/0434/9581/7382/files/kuxofiwafiwefoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/familia_sarcophagidae.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/l_appareil_respiratoire_humain.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3077/files/bovitot.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2261/files/bromic_chest_freezer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7193/0529/files/buxivijafipabirokij.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/gelezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0438/0049/4237/files/event_planning_template_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/vitiwazulexo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/vehicle_tracking_and_monitoring_system.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://cdn.shopify.com/s/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b15.bin
77955765dfaf60547e1815f68cfd335f2251fb2b8a892caa3d21c5f086ca24df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B15 5276 bytes
font_01_sfnt_off00008cf6.bin
1859597130c3467c7d8033fe2a88fdae90f0d60b1ba445b1ca7a10835bb631e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF6 14440 bytes

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