Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa41be1860edc24e…

MALICIOUS

PDF

49.6 KB Created: 2020-08-14 18:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38510054c2cf926dfd373de821f9ce41 SHA-1: 50ee6980c50e369d048b6dc83651a49c93c84cdf SHA-256: fa41be1860edc24eea2a1ce5df4960462acfe8f3c48a54fe0c96a61c38364a36
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a significant number of embedded links, with a critical heuristic firing for a PDF link farm. One of these links, 'https://ttraff.cc/pify?keyword=bfd3+operation+manual', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious content through a link farm strategy. The ML classifier also strongly indicated maliciousness.

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=bfd3+operation+manual
    • http://files.markwarrencoleman.com/uploads/1/3/0/8/130814680/ziluwalomare.pdf
    • http://files.iamstronglikemom.com/uploads/1/3/1/3/131382092/jikekiv-gonimiv-gositoxego.pdf
    • http://rizibizad.oliveleafhomes.com/uploads/1/3/1/6/131637814/3723892.pdf
    • https://cdn.shopify.com/s/files/1/0434/2494/0184/files/a_brief_history_of_argentina.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8340/files/cyberlink_powerdirector_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/zijulalobowuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/5366/1851/files/retavaxatuduki.pdf
    • https://cdn.shopify.com/s/files/1/0428/2620/3302/files/62484200234.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/honeywell_chronotherm_iii.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/lonobimezafegik.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084b4.bin
225ea39ff7545778b6a53be37dab3bb882bf5e08f3ffc847a44449c70ec388c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84B4 5224 bytes
font_01_sfnt_off00009664.bin
f382cf597aabbc109fbc515e7b525d803a5382a9009f73f1582f3f74e3b12a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9664 10420 bytes

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