Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9c3ea7d9ea76d6…

MALICIOUS

PDF

41.4 KB Created: 2020-08-03 15:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 542598e55fa5283ecdcc11ad917f03d3 SHA-1: a6fffc521b60524786553f867fcb1cd0c62e319f SHA-256: 6c9c3ea7d9ea76d6bc4f049235e20402a33aebf94a2b14a3b8ed110fe3b7bd4d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious 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.com/pify?keyword=advanced+bestiary+pdf
    • http://files.mistybluesbunnies.com/uploads/1/3/1/3/131397964/sozuvaxobowa-gotozukula-xisitorusanawa.pdf
    • http://files.nomadnubians.com/uploads/1/3/1/3/131379434/b3b0c70021e.pdf
    • http://files.joaomiguelbranquinho.com/uploads/1/3/2/6/132696512/4902395.pdf
    • http://files.mackenzywatsonsportfolio.com/uploads/1/3/2/7/132740804/puwizubewogila-devag-nuzumarirak-repowunevifi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/nepozejuxavaba.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/takovigiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/magic_training_guide_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0432/5900/3038/files/tivakasavozaziwemegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/11505011558.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/bikubugozipaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2084/files/10863053238.pdf
    • https://cdn.shopify.com/s/files/1/0431/3274/7927/files/lilozifeliraxofekagi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/70055193484.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/49293598043.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_off00006433.bin
4d54a87817d15ac30fe781849ea23e3dec0984910e4c956ff3ed8a50b048fd6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6433 5408 bytes
font_01_sfnt_off000076ac.bin
8abe235065f272373201567a9946a31f2f17d30501770a799a24d72022dc8184
pdf-font-stream PDF embedded font (sfnt) at offset 0x76AC 10144 bytes