Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d92cfef438a60a…

MALICIOUS

PDF

42.6 KB Created: 2020-07-28 16:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1992717572996f946b66157b1a883f75 SHA-1: 6d87ec685b2ce822ee9e8ae2245096ca1c19ec49 SHA-256: 36d92cfef438a60a2e587e4d400f84a58e6f64e4765832ea6a30b8bbb9820573
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL is ttraff.cc, which is known for redirecting to harmful content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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=kdigo+guidelines+transplant+candidate
    • http://files.ohanahomeschool.org/uploads/1/3/2/6/132695629/3465808.pdf
    • http://files.suntzugames.com/uploads/1/3/0/7/130740249/vatopiraxiwewoj-xasipuluxuwer-kezopik-xidak.pdf
    • http://files.kangenwater247.com/uploads/1/3/0/7/130776509/216f26.pdf
    • http://files.reverieofthereal.republicofdaydreams.com/uploads/1/3/0/7/130740211/kijekititap.pdf
    • http://files.thesummiteauclaire.com/uploads/1/3/1/4/131438002/zawetikorupote.pdf
    • http://files.ohanahomeschool.org/uploads/1/3/2/6/1
    • https://cdn.shopify.com/s/files/1/0434/4273/3221/files/wawofafalode.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/lijoribanututi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/tevumubusurusawapisuful.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/35880190176.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdf
    • https://cdn.shopify.com/s/files/1/0438/4768/0162/files/negalilosavuxoxobisib.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3475/files/lititepunowazuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/1268/5977/files/fuwululovafotedazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/zidaxasofawikumosiduzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4448/6824/files/84308048973.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/sipawujixivila.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/botuguxeduzamojasifenero.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_off0000688d.bin
5023c02c231de99ac7b6dbc77afa294afd0d3f65929643e61e831422954a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688D 5092 bytes
font_01_sfnt_off000079ea.bin
e95fa27e7023a47122e4307af9e2349d002f31f17635b5e23d6d6a993139084d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EA 10208 bytes

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