Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1deab55ef8a733…

MALICIOUS

PDF

39.7 KB Created: 2020-08-16 19:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c255ae38897092fea6b54586e564eb67 SHA-1: cccbd3b4acf656dbe09914a18db9e4da73ac6b88 SHA-256: 8a1deab55ef8a7334f051993befd3a6754b0c36dbea86734d42ba7b33e07c6ea
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure related to 'Australian dental association infection control guidelines'. The presence of numerous PDF links suggests a link farm or SEO poisoning tactic to distribute 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.cc/pify?keyword=australian+dental+association+infection+control+guidelines
    • http://taxij.parkcitybrewery.com/uploads/1/3/2/8/132814930/jutikoxukat_viretomesepex.pdf
    • http://fegusun.scottyanco.com/uploads/1/3/0/7/130740596/xaludireko_rasefanoxixo.pdf
    • http://wovab.juliergoddard.com/uploads/1/3/1/1/131164392/rumunapadifo.pdf
    • http://paxive.spatiallaser.com/uploads/1/3/1/6/131606000/koginalifumadej_posix_jivegawamolopig.pdf
    • http://files.inscience242.com/uploads/1/3/1/4/131406558/fijiv.pdf
    • https://cdn.shopify.com/s/files/1/0443/4237/8652/files/learning_styles_inventory_for_elementary_students.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/39466174317.pdf
    • https://cdn.shopify.com/s/files/1/0437/6746/4093/files/hernia_de_hiato_alimentao.pdf
    • https://cdn.shopify.com/s/files/1/0434/3778/5240/files/vemokopigozerawiwu.pdf
    • https://cdn.shopify.com/s/files/1/0449/8276/3679/files/swing_trading_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0437/7657/3601/files/kifapozixegumali.pdf
    • https://cdn.shopify.com/s/files/1/0437/2316/1768/files/59304979327.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/curso_de_economia_introduo_ao_direito_econmico_fabio_nusdeo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/68031663596.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/gezopuninoz.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_off00005c4f.bin
27eb66891dfc3f431c5175cb6c040e8a7c772b877e5114dab7a71172ce5b5628
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4F 5180 bytes
font_01_sfnt_off00006df9.bin
401daea9c6608b66d290188f116f4d0d21a4cc280352da39cda69155f1689695
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF9 10400 bytes