Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b28c85a66022ed…

MALICIOUS

PDF

40.2 KB Created: 2020-08-09 18:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6f9d0fe0a21ea5f2027bfc631232f4c SHA-1: 1b606c8673cfb4d46b8809a161f894694d64578b SHA-256: 83b28c85a66022edbfd715a7cca50e5b2ef2e571e9ca2f079e708f332f054f58
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a URL associated with malicious redirector infrastructure. This link is presented as a download for an English idioms PDF, but the underlying infrastructure suggests a malicious intent to lead users to further harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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=essential+idioms+in+english+phrasal+verbs+and+collocations+pdf+download
    • http://files.eastprospectparade.org/uploads/1/3/1/3/131398406/4654654.pdf
    • http://files.uffstreetwear.com/uploads/1/3/1/3/131380308/siposiva_lavenolofu.pdf
    • http://files.bcahope.com/uploads/1/3/0/7/130775519/wenedopudomer-ragimisipu-jigogonugupexuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/jowofofoturulodib.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/mofomagusitisom.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0055/files/seluxamudagupegetufemefo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/sidufizufolina.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/rirojazup.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/sasozafudi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9589/1871/files/72021251957.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/ziruzakized.pdf
    • https://cdn.shopify.com/s/files/1/0436/9324/4570/files/minecraft_potions_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/51778368648.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/73529113477.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/rapajimojelubexapisaraz.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_off00004fb8.bin
d380c687f6b07d8ad9980a7d0b4b9f4772538688b857a56e5729dfeb9727b943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB8 5608 bytes
font_01_sfnt_off000062ab.bin
7cd0fdfd696b4033efc3002626369f92d861dbef5230ab7cbe753b706fb6d615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 10120 bytes
font_02_sfnt_off00008549.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8549 4324 bytes

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