Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0794c4aacadc7e9…

MALICIOUS

PDF

43.7 KB Created: 2020-09-01 19:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e34ebde7d6b1fb6af9b9720ea4c0a9a0 SHA-1: 434bc983c3d26260a47fe6043ee3e40954e54576 SHA-256: c0794c4aacadc7e9006880b5959b77a281fc80e89dc48887c92c62382a2f16e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.me'. The document body, though heavily obfuscated, contains the same URL and text related to a 'color blindness test free' lure. This suggests the primary intent is to trick the user into clicking the malicious link, likely leading to further malware download or phishing. The PDF also contains a large number of external links, many pointing to Shopify, which is flagged as a link farm.

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.me/wix?keyword=color+blindness+test+free
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/physical_chemistry_a_molecular_approach_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0438/7579/5099/files/upbeat_ukulele_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6798/1476/files/36237459887.pdf
    • https://cdn.shopify.com/s/files/1/0437/7709/7886/files/belusojuragujer.pdf
    • https://static.usrfiles.com/ugd/22bf55_049fc651292945d59c4569ee4e1671e7.pdf
    • https://static.usrfiles.com/ugd/80bfa9_99239c53d34744d781e1cc87abb9ace5.pdf
    • https://static.usrfiles.com/ugd/07625c_87cb029cf7b049488fb52b3bef89a8f5.pdf
    • https://static.usrfiles.com/ugd/ab922d_050ea46f5fa640cfa183dab58fc5f36d.pdf
    • https://static.usrfiles.com/ugd/affb4a_7c683fe5d5d847cfb5b51f9d09bc3bdb.pdf
    • https://static.usrfiles.com/ugd/6908d7_e98b9980a58742a6a7816cce2f7365d8.pdf
    • https://static.usrfiles.com/ugd/f4de5e_892a95d15549400c976003d0ffb8a632.pdf
    • https://static.usrfiles.com/ugd/b8c837_451c29b0534c40898134d3f27dac7462.pdf
    • https://static.usrfiles.com/ugd/5be868_d5dd62c2e94c42eca8249f586df688a4.pdf
    • https://static.usrfiles.com/ugd/73f3b0_ba6aa00127f240e69e469e79a7b3a682.pdf
    • https://static.usrfiles.com/ugd/cc14e4_5e177f3e9b384668bb773f98aa1861c9.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_off00006f58.bin
b827049ba9533f0e92b434ad0c7e13ef143e0c1d605a0a10e682dfed9551f6ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F58 4736 bytes
font_01_sfnt_off00007f76.bin
5a7baf2e4de8cc75b8bf1a77be6ee51fd2e4b0502dc8e5bd6d74915f6d89a591
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F76 10128 bytes