Malicious PDF — malware analysis report

Static analysis result for SHA-256 8756804a6561fa89…

MALICIOUS

PDF

38.8 KB Created: 2020-08-16 23:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd86bb76ab0d399c19363c0d0985e28a SHA-1: c86effcb98393c5cbf432cdb96ab6aaeef6e6ca9 SHA-256: 8756804a6561fa8901e4a86a2e7300cd56da42105f1bd1a5500c9645bfcae2fd
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users into clicking on further malicious links. The document body, though heavily obfuscated, contains text related to 'spelling numbers out worksheet' and includes the malicious URL, suggesting a social engineering pretext. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content.

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=spelling+numbers+out+worksheet
    • http://files.legacyhorselogging.com/uploads/1/3/1/6/131636990/rakofidi-tuxujojaxeki.pdf
    • http://jarusi.lastwatchhorology.com/uploads/1/3/1/6/131606346/ee5731e5f666d.pdf
    • http://files.bestpickeddiets.com/uploads/1/3/1/6/131606465/1a697.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/63670980213.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/4958631902.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/29978673134.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/63734671727.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/96232701117.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9295/files/the_iliad_lombardo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/67599496972.pdf
    • https://cdn.shopify.com/s/files/1/0434/7409/2198/files/saxalutamaziwasopikilet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5232/files/pozexuzuxizuxalaxowopu.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_off00005991.bin
787450be53a6b45e2c66ca44d394830ada850000dae824cdc39dfe64c14bd82b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5991 5424 bytes
font_01_sfnt_off00006be6.bin
6249dd14959fb6840d281b4501447a47345b1ce2183dd5bb92469cb4bf05cc7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE6 10100 bytes