Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedd28cef55b10a0…

MALICIOUS

PDF

45.0 KB Created: 2020-08-02 14:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 292d0909e6e28df1a7cceccd34a02827 SHA-1: bfc6db7d4b04a8bef27f1e4c78e3826248d0def3 SHA-256: cedd28cef55b10a06fbdce255a55864759a9e21260e82b93c3bfeef9171c3cd6
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with the primary URL pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The presence of multiple embedded URLs and the ML flagging point towards a malicious intent to redirect users to harmful 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.ru/pify?keyword=pantheon+cookie+clicker
    • http://files.lazonbyvillagehall.co.uk/uploads/1/3/0/7/130740553/tidegubugalidufum.pdf
    • http://files.justaddwatermarinesales.com/uploads/1/3/1/4/131454620/selebo-kapoxi.pdf
    • http://files.pulse-uca.org/uploads/1/3/1/4/131453076/9118fbd2b.pdf
    • http://files.smiledefenders.com/uploads/1/3/0/7/130739144/5f35b0.pdf
    • http://files.thehammam.org/uploads/1/3/0/7/130775405/todavog_dipagid_pezes.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/xesulexejazagu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/69585538543.pdf
    • https://cdn.shopify.com/s/files/1/0432/5864/2600/files/83229092810.pdf
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/94465015495.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/88313984343.pdf
    • https://cdn.shopify.com/s/files/1/0432/6001/8852/files/40485318247.pdf
    • https://cdn.shopify.com/s/files/1/0432/6493/4043/files/mojom.pdf
    • https://cdn.shopify.com/s/files/1/0430/3087/2215/files/bixajemodinovinolememox.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/70097632949.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/benigezumaxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3136/1686/files/cub_cadet_owner_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/bizimigalivibug.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7255/files/51185628371.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_off00007365.bin
2c4c3fd1e57920b570f89edaaaeba55f31d77b8affaaf4eb226b77c8d7becb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7365 4776 bytes
font_01_sfnt_off00008397.bin
ac4572c26b70c340d17a0ac3f2991f654c5cee2a820a9ab1e0dce64b84e05d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8397 10260 bytes

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