Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb4e169ca2b2728…

MALICIOUS

PDF

45.0 KB Created: 2020-08-30 23:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 023161651fcb9522aaff9203a98d698d SHA-1: 9b08472ac0e7ed57cab2096f361600e25fa290d4 SHA-256: bdb4e169ca2b272811bc477581378335e74c4fbd7d0d9c2bbf4714bfcb80a90b
150 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, disguised with keywords suggesting a tutorial. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and PDF_SEO_LINK_FARM indicates a large number of similar links were generated. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the target URL and keywords, suggesting an SEO poisoning attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=microsoft+access+2007+tutorial+bangla+pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/flame_painter_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/endoplasmic_reticulum_structure_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7206/files/after_we_collided_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/autobiographical_memory_interview_short_form.pdf
    • https://static.usrfiles.com/ugd/cac9e4_21b58dbe0adc4f64a303b0ce0da29549.pdf
    • https://static.usrfiles.com/ugd/345929_1face0ceae364d67a2291b8cccf4609d.pdf
    • https://static.usrfiles.com/ugd/d775a9_940cbbe798444ca58cb42c1b6f932cd4.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_4737566ccaa84411922f95f33eeb6912.pdf
    • https://static.usrfiles.com/ugd/b85eb0_cd043973eb6a463fbd3e6ed9e7ad98b6.pdf
    • https://cdn.shopify.com/s/files/1/0438/7107/6520/files/wipulefopekuxabamawipudob.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/4518336567.pdf
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/fiwejuvegavajimikatoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/rugazu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3030/5175/files/dadaz.pdf
    • https://static.usrfiles.com/ugd/2c8d66_cb596a2bb2f346d4bf9befbb5eb161d5.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_c02b173bcff248bca35157a3cf47dd85.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1af31325dd04060929ca47486efe374.pdf
    • https://static.usrfiles.com/ugd/b91566_9098d16fa49e4bd099cc115e3c0f8db2.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_off00005666.bin
853f01445245703c717c07298420d2b6e5b72d8815e7d8472aa31d9357dc2d6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5666 5704 bytes
font_01_sfnt_off000069d1.bin
7ca68e9f57f8b509d78843466bb888b6777f0a800159f8247a720325f8728dc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x69D1 14476 bytes
font_02_sfnt_off000096fa.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x96FA 4324 bytes