Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed89aa4c21fbae6…

MALICIOUS

PDF

42.3 KB Created: 2020-08-27 15:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36f631f0f62a391ff8156dadade59458 SHA-1: 0853ddcb170c63e8c8145e7f523ef67122d6f8bd SHA-256: 2ed89aa4c21fbae666f2de2b1d1d12e231ea0b0af3756a9e8ef61586b3534a80
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, characteristic of a link farm. One of these links, https://ttraff.ru/pify?keyword=skill+combinations+divinity+2, directs to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was largely unreadable, but the link farm behavior and the redirector URL are sufficient indicators of malicious intent.

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.ru/pify?keyword=skill+combinations+divinity+2
    • http://files.anagnjatovic.com/uploads/1/3/2/8/132814977/rirufula-bokamig-zamavavodor.pdf
    • http://files.failurefarms.com/uploads/1/3/0/7/130738881/kemore-tiwemoja-selapagizat-wesovazolome.pdf
    • http://numogot.lawfirmcebu.com/uploads/1/3/0/8/130874118/mibowodibulewevawi.pdf
    • http://files.avotova.net/uploads/1/3/1/3/131383825/xiripesep.pdf
    • http://files.andrewbroomphotography.com/uploads/1/3/0/7/130775310/9be3c5b88fd891.pdf
    • https://cdn.shopify.com/s/files/1/0437/1418/3323/files/weputebimip.pdf
    • https://cdn.shopify.com/s/files/1/0457/5831/6700/files/90887494275.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65817182127.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/5690959895.pdf
    • https://cdn.shopify.com/s/files/1/0440/1351/9006/files/play_sims_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0451/0436/5733/files/jerewusanebenuvokazib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/11141375032.pdf
    • https://cdn.shopify.com/s/files/1/0437/9328/5277/files/kenmore_mini_ultra_sewing_machine_ma.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_off0000681c.bin
6faac41f3e3c206ca57e6d53dcfd785f05ad17185b49c96967b59c50b5bbeef2
pdf-font-stream PDF embedded font (sfnt) at offset 0x681C 5588 bytes
font_01_sfnt_off00007b05.bin
2bdbd161e553346dec7654e3b7762e081f42df68ced4dc37a4e2820357cfe651
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B05 9796 bytes