Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f33288a1f3d479e…

MALICIOUS

PDF

60.4 KB Created: 2020-08-14 12:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 234f9f2962d5d3dc68ed2211c6fccdb1 SHA-1: 9e976029458b59969995e95fb423f8faec9d2d0f SHA-256: 9f33288a1f3d479eb45a5d911b825ea3f456f380e12f0d72eea2d441b3ded982
154 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 of which point to a link farm hosted on ttraff.ru. This heuristic, combined with the ML classifier's high confidence, indicates a malicious redirector pattern. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the attack pattern. The primary IOC is the malicious redirector URL.

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=kodiak+island+bear+guides
    • http://files.heartsongarts.org/uploads/1/3/1/0/131070009/vuliwuligovekexe.pdf
    • http://files.patiencereformed.com/uploads/1/3/0/7/130776592/zofimosowoj_gomus_lejimikego.pdf
    • http://files.lavoratodesigns.com/uploads/1/3/0/9/130969176/7220214.pdf
    • http://jipuk.michelle9luo.com/uploads/1/3/0/7/130776688/tizapepafuguk_sopebetida_nibavetikixopaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8906/0259/files/basic_civil_engineering_books_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/poptropica_time_tangled_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/vewibokafe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0283/0745/files/lagu_amelia_terbaru_2018.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/bozobeborotevojasowaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/rodetiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/49699453166.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/85469788532.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/air_pollution_vtu_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/vefumulebesavijozodomezu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6939/1527/files/gipewalupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/tegupaboxawasafiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/bolepoganubafarobapuwi.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_off0000a139.bin
00226c62ecc1a45cc66bbfaa35f8a58d94721bb5374ec8eb37df553be924c758		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA139 4968 bytes
font_01_sfnt_off0000b21f.bin
acce1fada02952632d737281739e3b1ffbfe8d26850834a7a519a85fd41105ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB21F 10568 bytes
font_02_sfnt_off0000d641.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.