Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac5c4aeff7c0100…

MALICIOUS

PDF

42.6 KB Created: 2020-08-20 10:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec2dbf11bbd5b63329df7c18a3d98399 SHA-1: 46eb6e348d9a0e3adb20d9aab8a7a07e2cc8b7e5 SHA-256: 6ac5c4aeff7c01003ef3851873f281700a97f2a4e804bc609b12b44acd97a5f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a redirector to malicious infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, contains a URL that appears to be part of the link farm, suggesting an attempt to manipulate search engine results or distribute malicious content through a large number of links.

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=awesome+fonts+free
    • http://files.thespeakerstore.co.uk/uploads/1/3/2/7/132740281/taxanorokatuw-vomupelix-vavireve-kugowibe.pdf
    • http://files.southernyogatherapy.com/uploads/1/3/1/4/131438899/8808073.pdf
    • http://files.sakonnetlighthouse.org/uploads/1/3/2/7/132712119/wotogegowuzepoxomen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/novobuzuzitukekaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/9284/3422/files/brushless_dc_motor_primer.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6997/files/14001215900.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/94465685907.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/jetenifowatolojufesaxab.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5644/files/67576776979.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/lowawuneboxigifirabutufug.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/15951410295.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/chrome_os_iso.pdf
    • https://cdn.shopify.com/s/files/1/0437/9626/7168/files/18413754378.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b2e.bin
f2bdf8d2adfc76e8697fab0af4cb160b4865c7f95e05f80e8c3a64966f408a32
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2E 4752 bytes
font_01_sfnt_off00007b4c.bin
793ef4e3860ea573396ad71baa1fa83f8ed5985524cd5e877c734a93e4c89b48
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4C 9908 bytes