Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5f154ce3e9804e…

MALICIOUS

PDF

50.9 KB Created: 2020-08-10 09:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9a6a69eae524f9d46a676fb393e5dba SHA-1: 80a29c55aedcfac117cc10bfc7b4cd0a61bfb04b SHA-256: 8e5f154ce3e9804e7275f6f483ead8fe25ec235c6360731cada9f396d67c793c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a malicious redirector URL, indicating a lure to external malicious content. The document body, though heavily obfuscated, contains text related to 'Cryptocurrency for beginners pdf free download' and the malicious URL https://ttraff.cc/pify?keyword=cryptocurrency+for+beginners+pdf+free+download, suggesting a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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=cryptocurrency+for+beginners+pdf+free+download
    • http://tejom.elizabethjohnsonphillips.com/uploads/1/3/1/4/131409090/fcb81c0.pdf
    • http://files.grannypeacebrigadephiladelphia.org/uploads/1/3/0/8/130813378/8901277.pdf
    • http://palidubiv.kobeasianfusionrestaurant.com/uploads/1/3/2/6/132681233/sowug-rimedegubej-gaxupodifusav-rinakola.pdf
    • http://zosapojo.gamecourts.com/uploads/1/3/0/7/130775997/dodufivuledu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/63076252205.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0098/files/pumipebilapipanus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/17286250090.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/dutosivawezejedo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1739/4586/files/31829293410.pdf
    • https://cdn.shopify.com/s/files/1/0434/0383/7591/files/84094394639.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61051106257.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3834/files/english_pronunciation_dictionary_cambridge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/brainstorming_rules.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1781/files/78054614851.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3284/files/76467512079.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/tudulor.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_off00008597.bin
7fba35ea35e3f8d31a0a49eb3366170d628511aed9865465c54a61dcd4436ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8597 5560 bytes
font_01_sfnt_off000098a4.bin
9c89896003f2d561af55cb2c259d9535a8ef27c962149ea191a2cf6682580b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A4 10916 bytes

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