Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd81b7bdcd3e7df…

MALICIOUS

PDF

49.1 KB Created: 2020-08-14 04:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7d57dd4ea163857c069926966aa0e2b SHA-1: 97bce68f27104db048a9682d3efcd5ce7ff32ff4 SHA-256: ecd81b7bdcd3e7df233f3c079ef8244828a2a0f664416101744b38d64ea4ed1c
150 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised with text related to 'Inside actors studio questions answers'. This suggests a phishing or social engineering attempt to redirect the user to malicious content. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious.

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=inside+actors+studio+questions+answers
    • http://files.cpmbl.com/uploads/1/3/2/6/132682639/1577260.pdf
    • http://files.bethanymissbaptist.com/uploads/1/3/1/3/131383333/1a197deac59b82.pdf
    • http://files.antoniosirianni.com/uploads/1/3/2/7/132740361/7232707.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/33438036009.pdf
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/aristofanes_gredos.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/mnemonics_techniques_to_improve_memory.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/woxilutopax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7460/8545/files/take_me_away_a_secret_place.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/luvigetasivitofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/9867829238.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/the_complete_bartender_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/96243113174.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/54566849796.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8445/files/two_letter_english_words.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7051/files/bacon_s_essay_of_truth.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/77210506056.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/8179252961.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_off000082e5.bin
84ba8bbc6b38f5b7599639a8df73065e6501eeb81a3e74d432835072067a1ace
pdf-font-stream PDF embedded font (sfnt) at offset 0x82E5 5056 bytes
font_01_sfnt_off00009427.bin
b6a12786a92d62fcae6eb95b1a3869c23d201c099eb6e763c844a2da8e4f4c8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9427 10408 bytes