Malicious PDF — malware analysis report

Static analysis result for SHA-256 8998d8dbaa758c01…

MALICIOUS

PDF

50.4 KB Created: 2020-08-02 08:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10fca58485d9bf2bb9407edbb46cf13b SHA-1: 91df9e1f47e426745412a90d2df2f2e66333fe97 SHA-256: 8998d8dbaa758c016d18db3b0fb947304058c960656a7c3ae44963d1a78fc014
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a link farm of 16 external PDF links. One of these links, 'https://ttraff.ru/pify?keyword=om+shanti+oshana', points to known malicious redirector infrastructure. The document body contains obfuscated text and metadata indicating it was generated by wkhtmltopdf, suggesting a potential lure for users to click through the embedded links.

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=om+shanti+oshana
    • http://files.artists-cove.com/uploads/1/3/1/4/131438611/faf4c.pdf
    • http://files.defiantcircusarts.com/uploads/1/3/2/6/132695714/moxevefi-lorezajenu-xijugumukapibub.pdf
    • http://files.commercial-doors.co.uk/uploads/1/3/0/9/130969971/jevovutel.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1135/files/mijopobuguxorerigi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3336/files/4073059049.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/32953488663.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/6162965072.pdf
    • https://cdn.shopify.com/s/files/1/0431/3271/5163/files/bodiromiton.pdf
    • https://cdn.shopify.com/s/files/1/0437/5665/0650/files/wonolibez.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/page_417_big_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/legix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/kividogititubapufexofovin.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8904/files/lakapibikulababa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/zewaxesal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37741658126.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6719/files/63053365624.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000675e.bin
b190e611e7ddaf23dde78ce6b1b86b266bc7e94cb977527f43b4873b1fa5de60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675E 4492 bytes
font_01_sfnt_off0000766b.bin
bda948e35cec060ab596681709f69545a5d48309e652da5db4d88348d4acdeca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766B 10096 bytes
font_02_sfnt_off00009934.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9934 16164 bytes
font_03_sfnt_off0000ae49.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE49 4324 bytes

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