Malicious PDF — malware analysis report

Static analysis result for SHA-256 376f90e5284b601a…

MALICIOUS

PDF

33.9 KB Created: 2020-08-30 20:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 372a308b306f6f5b70f58b844c601088 SHA-1: d9bc6c58fbc882a496c06c581e0751397464cbfa SHA-256: 376f90e5284b601a45d61b4d08cbfb40f4139f77adfc2e1b2ae115b7212a24cb
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used to create SEO spam or to redirect users to malicious sites. One of the embedded URLs, https://ttraff.cc/wix?keyword=dragon+age+rpg+set+2, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of the malicious link is the primary indicator of compromise.

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.cc/wix?keyword=dragon+age+rpg+set+2
    • https://static.usrfiles.com/ugd/b8c837_f989ae8e67454aa888573520db37d1a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7566470a67f4d2f9b2a0e6f8c7a8f65.pdf
    • https://static.usrfiles.com/ugd/3e5d97_6cc8c391c352428ba7169ea233807a00.pdf
    • https://static.usrfiles.com/ugd/5b5da7_e1c8f464d9c84432b02e0431a8b67701.pdf
    • https://cdn.shopify.com/s/files/1/0430/3093/7751/files/fumudifuvimevorikogerap.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/36198596693.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/bibojiragibabenolor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/mokidugusuziweposi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/dosiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/artificial_intelligence_lecture_notes_computer_science.pdf
    • https://cdn.shopify.com/s/files/1/0447/9116/9185/files/71139200883.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/dimijarazenoxedupe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3455/9143/files/33557915519.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/wepabuvazujebopufopexo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/all_formulas_of_basic_electrical_engineering.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_off000046ce.bin
203d8dbda41f1b6caf8c9dc287e3dce7a7c9adde4d2076a51bd1f80032499c5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x46CE 5088 bytes
font_01_sfnt_off0000582a.bin
b3f087711f6fd9381e9a61d5b021d23f1eb2a34206929ed79892903a88e8d2f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x582A 9968 bytes