Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e670ca88623bdeb…

MALICIOUS

PDF

54.9 KB Created: 2020-08-31 17:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed4de19b3495031d7405a2d830ad03af SHA-1: 595462fe1690b66c26fac94422e0ff4ea7c07bad SHA-256: 3e670ca88623bdebdfd31ece84a5394f740ff6dde773f60cd22e280ee63e8fc4
154 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URLs, many of which point to Shopify domains, but one critical URL, 'https://ttraff.cc/wix?keyword=auto+chess+apk+offline', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL and references 'auto chess apk offline', suggesting a lure to download potentially malicious software. The ML classifier also strongly indicated maliciousness.

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=auto+chess+apk+offline
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/two_stroke_engine_working_principle.pdf
    • https://cdn.shopify.com/s/files/1/0439/4693/4430/files/5675552045.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/63926296325.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5804/files/html_templates_for_online_shopping_website.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9945/files/dte_outage_map_report.pdf
    • https://static.usrfiles.com/ugd/8b9728_4735aefe77c8452a9b41f17717ed9134.pdf
    • https://static.usrfiles.com/ugd/9757e7_1d771f4f1f4645c5acf7988aa8487e04.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a2192de26d94b5da3afd4c2340e83db.pdf
    • https://static.usrfiles.com/ugd/314c35_60e30c9dcbea40fa8dad315e698ce821.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/48247107575.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/minecraft_hack_1._12._2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5196/files/websites_without_http.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1635/files/pamafewemirit.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cf8.bin
013fc9f45313cdddd5762e6694753e55f6a85ad2eec225b6e17fd140af1ee5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF8 2952 bytes
font_01_sfnt_off00007787.bin
b63c6b119f5ca8a7f09e17df403c7e69610f28c728487056233e02a35cfdb174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7787 5060 bytes
font_02_sfnt_off000088be.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 1800 bytes
font_03_sfnt_off0000914c.bin
668c78625eb1cddb1cfaca3e4a0fac3ba86f368f827dad4418d09a56c46c02a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x914C 10852 bytes
font_04_sfnt_off0000b69c.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB69C 16204 bytes

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