Malicious PDF — malware analysis report

Static analysis result for SHA-256 9743eb0665ab363b…

MALICIOUS

PDF

52.6 KB Created: 2020-07-31 18:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b97820dccbd6ca33ffd7f0e5587757e SHA-1: f968cde01f4e9a19fddd25f5ea6657db2dd034ad SHA-256: 9743eb0665ab363b3550d0623e2c94528bc692edef949bd4a421e92b91de4c15
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text '99 hunter guide osrs' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a link farm and a malicious redirector indicates a likely attempt to drive traffic to malicious content.

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=99+hunter+guide+osrs
    • http://files.shopdboutique.com/uploads/1/3/0/7/130740438/xowujimumuna_zegurawakefegik_babamewevewuke.pdf
    • http://files.beradiantbyrebecca.com/uploads/1/3/1/4/131453799/5675098.pdf
    • http://files.calmingtones.com/uploads/1/3/0/7/130775018/tejevonul.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/remap.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/6698242122.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6888/files/49084423062.pdf
    • https://cdn.shopify.com/s/files/1/0438/3725/9938/files/luvokodofalesin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4477/files/xowobudufudibesojofob.pdf
    • https://cdn.shopify.com/s/files/1/0432/2849/6036/files/turonegas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sasexenumufuxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/dowuwetekuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/11363196909.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/padofidodepinuzupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/zibazuxiretilul.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_off00008451.bin
345eaa8f53ec007ee95b0bf4402c9e6cbe58633ba645fc9eaa171e4211fa7249
pdf-font-stream PDF embedded font (sfnt) at offset 0x8451 4788 bytes
font_01_sfnt_off00009486.bin
865ffec9ec70f7fe09cbf23e4a681ed3c248f8ab381a761850767a41d3fd342f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9486 10308 bytes
font_02_sfnt_off0000b7af.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AF 4324 bytes