Malicious PDF — malware analysis report

Static analysis result for SHA-256 9206dd811fa2f168…

MALICIOUS

PDF

49.7 KB Created: 2020-08-02 14:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25baa51953f9e35fa78c7892ce839738 SHA-1: 98b3f1cab307aadee280367a7096670a48c4e92c SHA-256: 9206dd811fa2f16860ab87b42f2e0268016758978bac58970023d7d6af64dcae
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to either distribute malware or lead users to phishing sites, leveraging the 'SEO Link Farm' technique. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is a high-confidence indicator.

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=e5%2525+92%2525+b8%2525+e9%2525+b1%2525+bc
    • http://files.scfelix.com/uploads/1/3/0/7/130775328/97db97193d02.pdf
    • http://files.sweetstreet.info/uploads/1/3/1/4/131407469/7555571.pdf
    • http://files.en.oslomamma.net/uploads/1/3/0/7/130738751/faluzulojuputo-mezab-solos-xipek.pdf
    • http://files.burbankbees.com/uploads/1/3/2/6/132681426/6394184.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/diziludowiduwoli.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/wenotapujunukezewav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/jipalutuna.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0072/files/trey_songz_mp3skull.pdf
    • https://cdn.shopify.com/s/files/1/0428/3455/9143/files/fovozumogixakexovejazasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/79319281887.pdf
    • https://cdn.shopify.com/s/files/1/0432/4261/9035/files/62230085411.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/13209280164.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/81434898022.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/17218313802.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_off00006169.bin
ffa1c1719fc076e8554c8ba81a3e1194f659b0d15b90f376297629585ae61556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 5268 bytes
font_01_sfnt_off00007362.bin
5baf2f3fa83834bbd30f621a136862f9a99a2420df652236c082bb157bf2c3f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7362 15368 bytes
font_02_sfnt_off0000a264.bin
a56c3305eae8c274f9530afc53b94bb11aea5b2e4106fccae25e6adbba8aa2c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA264 16260 bytes

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