Malicious PDF — malware analysis report

Static analysis result for SHA-256 794400ca70ae2aa1…

MALICIOUS

PDF

44.0 KB Created: 2020-08-15 12:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0956125d649a2a784bf2b2458138f161 SHA-1: 7340eef8c85f1a13865fbdba624e9584a6943444 SHA-256: 794400ca70ae2aa1127c03c8b7d6e7b5b03761899acd7eaa60af78be665ecb59
154 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 presented as a vocabulary worksheet creator. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple suspicious URLs supports a phishing or redirection attack pattern.

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=vocabulary+worksheet+creator
    • http://xowudifes.adaptivedrivingexperience.org/uploads/1/3/1/3/131383541/3868f75fe7341e.pdf
    • http://zizif.mindfulohio.com/uploads/1/3/0/7/130775505/95270c9583f0a.pdf
    • http://files.garrafraunsns.com/uploads/1/3/1/8/131871677/61d99e616122b5.pdf
    • https://cdn.shopify.com/s/files/1/0434/0137/9996/files/brs_biochemistry_molecular_biology_and_genetics_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/juvugaseximere.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/67450126924.pdf
    • https://cdn.shopify.com/s/files/1/0431/8081/8581/files/veborep.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/shifty_eyes_emoticon.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/38328252275.pdf
    • https://cdn.shopify.com/s/files/1/0434/3722/8188/files/vocabulary_words_with_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2600/files/injustice_gods_among_us_pc_mods.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8726/files/kavozufatatofomurokuxid.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6613/files/87835276110.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_off00006d53.bin
d3eadea41e19cf84dd4f4f9c67a4f1deb8b5766b45b9beb67b3892750c1ad1d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D53 5252 bytes
font_01_sfnt_off00007f36.bin
bc491fc311f79e937d08b578dc84788056ddca125131ab6e3ea33d0df5dd8829
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F36 10596 bytes