Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0069547eab6411…

MALICIOUS

PDF

57.9 KB Created: 2020-08-08 14:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1d097da5f8909d979c66ca083d239a8 SHA-1: e39a912cd217f186a52ba24c751cbb80cbdc5afa SHA-256: cd0069547eab6411749338ef978863dc9b899042d6f136335e8ece9bc8c7e236
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic firing indicates a link to known malicious redirector infrastructure at `ttraff.com`. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text and metadata suggesting it was generated by `wkhtmltopdf`, and includes the malicious redirector URL within its content.

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.com/pify?keyword=atmega328p+programming+in+c+pdf
    • http://files.cristinaliomakeup.com/uploads/1/3/1/3/131378975/popovowugofu.pdf
    • http://files.waveloopart.com/uploads/1/3/2/7/132740343/883d0.pdf
    • http://files.bethlehemchristianmission.com/uploads/1/3/0/7/130775320/d602756b33b.pdf
    • http://files.greekschoolonline.com/uploads/1/3/1/1/131164067/47fe2cb.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/febiwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/novorubafiwani.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/52226452666.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/71785985036.pdf
    • https://cdn.shopify.com/s/files/1/0440/8439/6184/files/accounting_information_system_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0440/8747/6389/files/pdfgeni_book_e2020_world_history_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/9997/8904/files/92543706307.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/bobonepejevewixititanom.pdf
    • https://cdn.shopify.com/s/files/1/0437/4613/2129/files/nuramudilanimupifole.pdf
    • https://cdn.shopify.com/s/files/1/0433/7097/1299/files/nikelafaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/79277244699.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ad5.bin
bc1329f6634f13fd60974661026cec86d026ebef0afa26cc4b406b58d1911f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD5 5532 bytes
font_01_sfnt_off00009d84.bin
334c9b01b1cf21dbe0c0cd83b1e6db49ed50a26d8b9e7cb72e115bd549a01d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D84 14660 bytes
font_02_sfnt_off0000cc73.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 4324 bytes

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