Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6a1e2bd269ecf5…

MALICIOUS

PDF

51.7 KB Created: 2020-08-29 14:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6bc811cade475b8ffd060122a9510b SHA-1: 6b26b0a780fa65fd131a2129942ed71adfe60b05 SHA-256: 1b6a1e2bd269ecf56ae56acc41f4eb3f3ccf6f8d9a6bc9ff2578a8d307b94f08
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=important+quotes+from+uglies+with+pa'. Additionally, another critical heuristic indicates a PDF link farm, suggesting a broad distribution effort. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is sufficient to classify the attack pattern.

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/wix?keyword=important+quotes+from+uglies+with+pa
    • https://static.usrfiles.com/ugd/b8c837_e7fba31c2a3044cb83aa9e443b0decf3.pdf
    • https://static.usrfiles.com/ugd/67e251_d629513a31c04802a9d9a0f85b806a04.pdf
    • https://static.usrfiles.com/ugd/b8c837_a081cd24809f4b428fd79204165641de.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4324952299e432c89c1c870a1a8546c.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ee0ff665684b2c9ee38b46c1062274.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/tanigigu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/11032589802.pdf
    • https://cdn.shopify.com/s/files/1/0428/9747/3699/files/poparilowobamafe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7017/4870/files/federal_employee_performance_improvement_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/88465223782.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/ged_study_guide_2014.pdf
    • https://cdn.shopify.com/s/files/1/0436/6332/7385/files/17501074733.pdf
    • https://cdn.shopify.com/s/files/1/0438/0524/5597/files/sports_psychology_in_telugu.pdf
    • https://static.usrfiles.com/ugd/b8c837_e81dcfa48751459ab4ed4dbbcf9b34d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e5ae1a84cb4ed89e333e06beae123e.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_off00008b3f.bin
e8ac54a63caa064676772b5c67de1df846f44fc73d1a1d5c7ec7c1aa08d296d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3F 5468 bytes
font_01_sfnt_off00009db5.bin
8db097b271db22ef2cff59c6bfebef13fd9a4d9f8548984aa5ed92f564841cae
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB5 10440 bytes