Malicious PDF — malware analysis report

Static analysis result for SHA-256 23809f2b25417549…

MALICIOUS

PDF

42.1 KB Created: 2020-08-20 13:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f988c2e3d3034f4df754ade9bb948c31 SHA-1: c3d55d7d6c4169159d7fe6519e75260df8ac0367 SHA-256: 23809f2b2541754948efdb708f525a50eee152dc6f8e23feb3ff8f9b46739741
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. It also contains a large number of embedded links, identified as a PDF link farm, with many pointing to Shopify domains. The primary malicious URL is https://ttraff.com/pify?keyword=sqlite+explorer+android+studio, which likely serves as a lure to redirect users to further malicious content. 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.com/pify?keyword=sqlite+explorer+android+studio
    • http://files.sleepschool.com/uploads/1/3/0/7/130776886/340905.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9772/files/69334286183.pdf
    • https://cdn.shopify.com/s/files/1/0451/8402/4725/files/yo_yo_intermittent_recovery_test_level_1_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sakumuxapiwitisozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/upsc_cds_ota_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/wugejizuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/73891044952.pdf
    • https://cdn.shopify.com/s/files/1/0437/1084/1000/files/38255023302.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/rupelenipimoze.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_off00005943.bin
63917ad6cee0fe47319f4d7f9167de8cb8d89c696472a45ff047714ec7a293e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5943 5252 bytes
font_01_sfnt_off00006b21.bin
0d1722cc193ae3eeb6e96186735cd3841c33af50bc54f30bc82de757977bbe47
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B21 3372 bytes
font_02_sfnt_off00007847.bin
de2748df1bda3f8781692d9434ba9039764a6019a3856ae99f1aaa039e77c775
pdf-font-stream PDF embedded font (sfnt) at offset 0x7847 10440 bytes