Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ded70f0330ec7aa…

MALICIOUS

PDF

57.2 KB Created: 2020-08-30 12:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d55050f0f5c28fe4b9696f621b341292 SHA-1: 47075c0ffaa1d0f8d005d337914ed0a138f26a50 SHA-256: 9ded70f0330ec7aae0f9d90e6b71a6c7984aac333e8fdde9987e4f4c78ccfc10
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is used in conjunction with a lure for a popular movie download. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or redirection strategy. 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.com/wix?keyword=bahubali+2+mp4+full+movie+download
    • https://static.usrfiles.com/ugd/73f3b0_3bda1c19c4314dd5bced3b62e54bd657.pdf
    • https://static.usrfiles.com/ugd/3fc21f_fdf70efb203a45d68c5622c07aaee2a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e274980e269b4dc382bf85d065d8eef4.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/50816770213.pdf
    • https://static.usrfiles.com/ugd/837d34_b68cde96ed854d289f258a97dd1bd469.pdf
    • https://static.usrfiles.com/ugd/e33828_5a0d0068343e4ea29a20c5e7e407b424.pdf
    • https://static.usrfiles.com/ugd/b8c837_607fbfb1d5f645238b825f8f09e0339f.pdf
    • https://static.usrfiles.com/ugd/b8c837_facd8f0f98a144e2b13d908f4d4011ff.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_ffbd256fa37141b5bd4effa13682c776.pdf
    • https://static.usrfiles.com/ugd/b8c837_c080850913a1470aabe575ec17ed4d95.pdf
    • https://static.usrfiles.com/ugd/b8c837_23bc1e9f24024887a160d64430be2cb8.pdf
    • https://static.usrfiles.com/ugd/e73fea_418445926ae24eb3b776fa43c1fcde02.pdf
    • https://static.usrfiles.com/ugd/3e9e83_46e05d50249d4237a0ef6cb0305403fb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000099ef.bin
a2b7e2d552f156422149717e2e1c308544e528514ff36290e154bd19dfca7024
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x99EF 20908 bytes
font_00_sfnt_off00006237.bin
24e6207b68c1a93f0220ecaf97aacd61183a2c3ea85ee90f74ad6ff4a72a0d2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6237 5568 bytes
font_01_sfnt_off00007523.bin
ee1b20898774a3633b1a8cac9b7db62dac5a01eb6a9df61207420f6fa92eb27a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7523 10704 bytes
font_03_sfnt_off0000bde6.bin
f7f498d14a53a2156c1decc5330d6a96790c1ffe4a53e4d8cd1dd029185d64c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE6 6868 bytes