Malicious PDF — malware analysis report

Static analysis result for SHA-256 be554448f37e0e00…

MALICIOUS

PDF

39.1 KB Created: 2020-07-31 10:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d378e9e3d377170ce7a8b5a44633a52 SHA-1: cf5465210b1e44d97308e334dbeec96943588010 SHA-256: be554448f37e0e00671aa846d00ce42044177beef9c5380eb4e8d0b20a02dcec
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be largely unreadable, but the presence of the link farm and the malicious redirector strongly suggests an attempt to lure users to malicious sites.

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=handbook+of+sociology+of+religion+pdf
    • http://files.bcovolleyball.ca/uploads/1/3/0/7/130739265/batoduketelerig-baweli-kuridupur.pdf
    • http://files.averti.be/uploads/1/3/2/8/132814439/2178706.pdf
    • http://files.monsterhub.org/uploads/1/3/1/6/131606533/2897904.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/falixasugojux.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/loranemogubidebum.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/ladabinumot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6731/8167/files/43657828193.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58085676994.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4359/files/45249745364.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7762/files/76777617022.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/86526303934.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/sixofodakiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/27813378510.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58085676994.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b07.bin
79b7582f30865611144bca9be24ef229a3c22a112389af6787a84cea8dbef404
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B07 5296 bytes
font_01_sfnt_off00006d10.bin
4f8583cf4e3fe7390c6c8c243ef5efc8e1f8dd4f5260f477a85b73703bb600f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D10 10084 bytes