Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e99d31816244f9…

MALICIOUS

PDF

129.8 KB Created: 2020-09-02 03:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d48eda417ebf6c6e2ab0e7ec67bc31b1 SHA-1: ff1e71939e2a3932d63ce0916f666f800f334e61 SHA-256: e9e99d31816244f95d3217f8f3da53f38ba0c0114bc52cd6f5c5b3affdcaa297
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The embedded URL points to 'ttraff.cc', a known malicious redirector. 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=free+bootstrap+multi+page+templates
    • https://static.usrfiles.com/ugd/b8c837_c158ba2cfbc04189b35daf60ae48f1cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6d52c594b6346f6a852138a574443f8.pdf
    • https://static.usrfiles.com/ugd/0b46e6_a1539c4ddf2f45f1a4d4f80be78fe016.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/rutinakamobase.pdf
    • https://cdn.shopify.com/s/files/1/0443/0227/0620/files/sukeliwedodovob.pdf
    • https://cdn.shopify.com/s/files/1/0446/9984/4762/files/biology_research_topics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79894841610.pdf
    • https://static.usrfiles.com/ugd/704566_907c057f1382453796b9be6803cacd0f.pdf
    • https://static.usrfiles.com/ugd/79e0dc_4bf5e8e9485b4f8f9cf318ca2f97a693.pdf
    • https://static.usrfiles.com/ugd/10e3af_d417a17d974349e39a98823e8beafebf.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_90d24b75ae7d494284bc77b4481f57a4.pdf
    • https://static.usrfiles.com/ugd/9757e7_ad1a82d8ec704ef4887f13f84a07bda2.pdf
    • https://static.usrfiles.com/ugd/e8506d_4f6a57f0b2844694b210b2599d645903.pdf
    • https://static.usrfiles.com/ugd/6290de_73aaeeb5c6b3467f97f4b3274c62ccd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe4d156699cb4103ae10e8fb5e5bc39a.pdf
    • https://static.usrfiles.com/ugd/b8c837_680cec348eef439dabd0a506550f8eb2.pdf
    • https://static.usrfiles.com/ugd/c068f8_e87a20a921194e9c9a0e4b8fcde2bb46.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_off0001c454.bin
b97047340c14f53a1d043c96bb639490b35354a1ca5530e2edc5277f2e8cdd7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C454 5236 bytes
font_01_sfnt_off0001d60a.bin
1dbb88d74308a41a4f56af685fc2a26f4fa610a7d64c7398ef80e26fb97f45be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D60A 10476 bytes