Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71731e0941b3b2f…

MALICIOUS

PDF

42.0 KB Created: 2020-09-09 05:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6c97bcb7df468485905aec120a6bebc SHA-1: 4319b5024a287bf90d8df61d38ec4b006688b540 SHA-256: f71731e0941b3b2f0dba7fff29de4884b38b87e666a8c007195b842cc635dd09
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a phishing or malware distribution attempt. No scripts were extracted from this sample.

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.me/wix?keyword=gerudo+valley+sheet+music+trumpet
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/cake_decorating_made_easy.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/94564468524.pdf
    • https://cdn.shopify.com/s/files/1/0438/2552/8989/files/quadratic_equation_worksheet_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4451/1645/files/resuwegomebipobukane.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64541570927.pdf
    • https://static.usrfiles.com/ugd/b8c837_067fd5a819054fd1a5076994dc77ec65.pdf
    • https://static.usrfiles.com/ugd/f84671_5f96064e4c34452a9cfda2a7853c8c53.pdf
    • https://static.usrfiles.com/ugd/43d598_8a4f57d714f648ebb9944ba379aa4ea4.pdf
    • https://static.usrfiles.com/ugd/b85eb0_3e4eab3807e649bb846fcffb4b1ba766.pdf
    • https://static.usrfiles.com/ugd/122077_fd3927dd4d5e4cf3a77778c464155bab.pdf
    • https://static.usrfiles.com/ugd/9c43ec_f05f205076ef47d58d674eed0ec389f2.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_f7184ca5a9c4486b93309342876d325a.pdf
    • https://static.usrfiles.com/ugd/105a8c_1c33178cf8114226b8f857216b3c552d.pdf
    • https://cdn.shopify.com/s/files/1/0433/3889/1419/files/vedotawebiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/2000_buell_x1_lightning_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/2286/6842/files/the_boondocks_theme_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6570/files/tejabudapameduti.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_off0000664a.bin
5eb30289a0f7a6f59030fd8f5da0b1f344d7ebbe73329fa5a370e0121eb8cdf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x664A 5504 bytes
font_01_sfnt_off000078ee.bin
417665b2e58c390f6252b0b3ec2d3993ecec21301dfab9bf1b987fd955b3dab8
pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 10024 bytes