Malicious PDF — malware analysis report

Static analysis result for SHA-256 55970939d5a5f834…

MALICIOUS

PDF

42.8 KB Created: 2020-09-01 00:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 325ac496f602a8d1c95b056579591e29 SHA-1: 48dc42ede904e2d02e66655c595f30beb300a18e SHA-256: 55970939d5a5f83488d0095b7aa5e27ef0bfbfacc9fd752ecdee2041a125993a
152 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to 'ttraff.ru', a known malicious redirector. The file also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link.

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.ru/pify?keyword=agent+vinod+songs+lyrics
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/tixafurefurujujukepasojam.pdf
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/pufisew.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/mechanics_of_materials_9th_edition_hibbeler.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/amaron_car_battery_price_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/0652/3552/files/87017928962.pdf
    • https://static.usrfiles.com/ugd/9b5f63_7605f9c8597546ed862f321491373220.pdf
    • https://static.usrfiles.com/ugd/63022f_955f017605d8485182119dbfc5ff55e3.pdf
    • https://static.usrfiles.com/ugd/b5aed9_391662ac4793470298a9fe9d11288d9e.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_88a45747cb0a43da836003e8769a7847.pdf
    • https://static.usrfiles.com/ugd/5ad03d_e45149d7a94e41719eae1a52a96d7b37.pdf
    • https://static.usrfiles.com/ugd/4826f5_fd00d4d26fdd445c974bb8c6d6155ed2.pdf
    • https://static.usrfiles.com/ugd/784815_1dfed95113fc486ab06ab08aca60132f.pdf
    • https://static.usrfiles.com/ugd/225520_f8668c9cc9304dc295dddce145d045de.pdf
    • https://static.usrfiles.com/ugd/b8c837_179928909eac40b2b6fdd4043b1e727b.pdf
    • https://static.usrfiles.com/ugd/c1108c_22f86ee28f7f42b7bba267379db8b67a.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_off00005de0.bin
16560fcb4644bbd9f726bd4ead9d76cad3b48f80f7a63eda84428edce1574947
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE0 5048 bytes
font_01_sfnt_off00006f33.bin
d29ec2e9da8141241d7347cc70973594e7aa65554da252dbd676641dd961d787
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F33 14816 bytes