Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fb3f2eff02464e…

MALICIOUS

PDF

46.7 KB Created: 2020-08-06 02:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7657a8435e9e8c6a0367b1769e082ac SHA-1: 694b5b29ba4739331b46ba9e89e1ffccbbd78457 SHA-256: 39fb3f2eff02464eb27081639eff2de4a53277f581f2d525e568f92c7ce3d93f
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=teaching+interview+questions+and+answers+tell+me+about+yourself+pdf, which is 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/pify?keyword=teaching+interview+questions+and+answers+tell+me+about+yourself+pdf
    • http://files.songsforfamilies.com/uploads/1/3/0/7/130738949/4103930.pdf
    • http://foxone.hitthebarre.com/uploads/1/3/0/8/130814328/8648975.pdf
    • http://files.crushsocceracademy.com/uploads/1/3/2/6/132681969/e1aac1e30.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2323/files/gikewagupi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9094/2888/files/wegosakewa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/rowerebetenuzalebowo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9755/files/21748396852.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/61716753091.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/69406093925.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/33539291183.pdf
    • https://cdn.shopify.com/s/files/1/0438/0285/3538/files/introduction_to_automotive_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0437/6454/7741/files/812248929.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/14625234997.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/32555702560.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006810.bin
4b4a0703f9033601d71e439af7a6af6a95b8cab24bb88e76e8018ffcd1f6b457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6810 5920 bytes
font_01_sfnt_off00007c12.bin
ce553009432d388e76d7f96957f3686f0b9c0b98066637a5715ceb64cfc0ee8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C12 10316 bytes
font_02_sfnt_off00009f54.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F54 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.