Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a877af2b8abe07…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 16:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abf9b9fc545009090ccb1dc2f5bad1a3 SHA-1: 9a06984285a2025ad744fb805b0719c90ec8feda SHA-256: 91a877af2b8abe078cc47a71c43af8b2a6b396b111c6e8c6659ae056919395a9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including one to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to Google Sheets formatting and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous Shopify-hosted PDF links further indicates a link farm strategy to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=conditional+formatting+google+sheets+character+count
    • http://vetabof.zuyu66.com/uploads/1/3/1/4/131407089/xajubixinozebazaruna.pdf
    • http://vuboba.beckervetclinic.com/uploads/1/3/1/3/131383314/9349671.pdf
    • http://files.healthbyhannahjean.com/uploads/1/3/2/7/132740482/luxurujupevu-pexiwin.pdf
    • https://cdn.shopify.com/s/files/1/0463/3044/5981/files/toy_blast_game_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/silekizezimepajetidomok.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4456/files/zosoduvus.pdf
    • https://cdn.shopify.com/s/files/1/0461/0424/8484/files/thousand_miles_tove_lo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6937/2576/files/let_it_be_beatles_noten_piano.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/83380344166.pdf
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/85972439248.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/wegefexejifewolexuja.pdf
    • https://cdn.shopify.com/s/files/1/0438/0894/8386/files/23748791497.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/arbeitsvertrag_ausfllbar_minijob.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/lifukavuvigilavetigapega.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/59720102435.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/18026758620.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_off00005ef4.bin
4e16319db81aeb906cfabdfe239d373dea97bd7e5ad820154f8a379e2ff57ff6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF4 5340 bytes
font_01_sfnt_off000070f5.bin
f59f2a91526c6fcb07d9fa7a5b4cf323c5c4dad5bf8696f14a625d077dd1dec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F5 10392 bytes