Malicious PDF — malware analysis report

Static analysis result for SHA-256 350965a44407e81a…

MALICIOUS

PDF

55.0 KB Created: 2020-09-01 03:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3448be97986b5b5f6508d59d9804f8ba SHA-1: 267c4f2add73fec837e89582aa079095a73e40af SHA-256: 350965a44407e81a678718ec5d4858d90f6ec27756b3f988f0eebad7a2bd195a
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm, with many external PDF links. The primary malicious URL identified is https://ttraff.me/wix?keyword=ngo+finance+officer+interview+questions+and+answers, which is likely used to redirect users to further malicious content.

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=ngo+finance+officer+interview+questions+and+answers
    • https://static.usrfiles.com/ugd/136d07_169a02ee11a74527b03acf6ec8abc6d4.pdf
    • https://static.usrfiles.com/ugd/0047a4_d50c715e350149d2ba4681486a0c861f.pdf
    • https://static.usrfiles.com/ugd/5ecadc_415c5cb62ddc4d31b3d68426fa87a49a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fd86df1d45b439bb0196b904063b124.pdf
    • https://cdn.shopify.com/s/files/1/0435/6849/6798/files/castlevania_anniversary_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetitoditasenubekuxon.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/juxowakuluvojidotokuli.pdf
    • https://cdn.shopify.com/s/files/1/0436/8121/8710/files/vamufovofebemunomukuvix.pdf
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/heart_shaped_box_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/bawawekexigadopewokum.pdf
    • https://static.usrfiles.com/ugd/ca300b_e0b0b59dfe2f42be979f923b30d0a8d7.pdf
    • https://static.usrfiles.com/ugd/2ddd39_e24f05847fa5497792a16932ff2fcd00.pdf
    • https://static.usrfiles.com/ugd/a382ee_72f99ed6fdb84311ae057290310d765f.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_off000098d3.bin
67ae0c39457197669685ccdd634f0360403b75c54237a69a50b0938ff4f1f966
pdf-font-stream PDF embedded font (sfnt) at offset 0x98D3 5404 bytes
font_01_sfnt_off0000ab5f.bin
fabc259887c02bb5312a58391bdcbae1a1e760d3a796ba63cde89310fbcad5b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5F 10404 bytes