Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc8f7610803bab0…

MALICIOUS

PDF

47.0 KB Created: 2020-09-04 21:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 147a7f1b6306562f0e1fc32836ee5c49 SHA-1: bd811ccf150ccb292a83df096b39462bb1f4afaa SHA-256: 3fc8f7610803bab09e6fd1ad950eb4ae888e640eff8711db7d028ddfc28ba06e
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=last+update+for+iphone+5s'. Another heuristic indicated a PDF link farm, with many links pointing to 'static.usrfiles.com'. The document body contains obfuscated text and a URL, suggesting a lure to entice users to click on the malicious links.

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/wix?keyword=last+update+for+iphone+5s
    • https://static.usrfiles.com/ugd/b8c837_1f8b8bba62af4412be69e927472d9040.pdf
    • https://static.usrfiles.com/ugd/834936_c1ceb0a63acd44b6acd40b4d57c6584a.pdf
    • https://static.usrfiles.com/ugd/04e6f9_f1a70e903ad443de8fad4fde5703f8b7.pdf
    • https://static.usrfiles.com/ugd/eb4c03_ad671bfe5a194f41bbfea94f93da7abc.pdf
    • https://static.usrfiles.com/ugd/b8c837_81582dceab494a0494e83f33b6a962d3.pdf
    • https://static.usrfiles.com/ugd/d5415a_e474eaf606544ac8b021cca8d941a7eb.pdf
    • https://static.usrfiles.com/ugd/f84671_6bc073a1c8154657ae7ab3c5df3435ec.pdf
    • https://static.usrfiles.com/ugd/1acd69_04ad7d967aed40f9927a4761da26a725.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_7d5f9c0a52e04cc89838518ebd977ab2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2069fcc385d483c8417b5d2b6ac7d3a.pdf
    • https://static.usrfiles.com/ugd/8aba0c_e6aee3939a914fb6b5945aee1b46869c.pdf
    • https://static.usrfiles.com/ugd/b8c837_86d72fb87252438da66d9ef3052ab444.pdf
    • https://static.usrfiles.com/ugd/2f7489_de46092a0afc4304834fca409d0bfe0a.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/everfi_financial_literacy_answers_higher_education.pdf
    • https://cdn.shopify.com/s/files/1/0436/5955/9065/files/426904506.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/42691928415.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/wurugupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/kodedutura.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069b9.bin
1da679758e09361c928010b541a5783e8d77c2d79841a2744702daff65e84217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B9 4420 bytes
font_01_sfnt_off00007940.bin
db1ba747aa935bcf8156d50ac1cc65adca310b847e730a9f14b6d7ba64136401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7940 5164 bytes
font_02_sfnt_off00008ad1.bin
5595f6c0cef258e48cf2d5f6f1acbc6a85f871439d554e923c7708b40994512a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD1 10276 bytes

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