Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf9cb451950948…

MALICIOUS

PDF

46.8 KB Created: 2020-08-06 16:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0349e8f6f6c8f249279aa14007b680c2 SHA-1: ea74fe7709f541e3e8d16194c89be0c98e403615 SHA-256: 8bcf9cb4519509481dccdd62c3ee0ee763ab61f1c4331c46556e473890ba2f91
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL and references to menu PDFs, suggesting a lure. The ML classifier strongly supports maliciousness. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=baobab+cafe+and+grill+menu+pdf
    • http://files.historyofparkinsonsdisease.com/uploads/1/3/1/3/131384098/kuxinisum-bufix-jatogusenora-wijipevaf.pdf
    • http://files.miriammccormick.com/uploads/1/3/0/9/130969160/jubunadekem-denesofiritav.pdf
    • http://files.lovingthestart.com/uploads/1/3/2/7/132712093/509171.pdf
    • http://files.darkderby.com/uploads/1/3/1/3/131381682/pinijimudix.pdf
    • http://jezeva.artbyannette.com/uploads/1/3/0/7/130776046/jeduvetozamizav-susubesowupazuk-kujoruzeloxetam.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/tuzedubinitogabuvejamuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9199/files/voluzoleporutezesef.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/vocabulary_exercises_for_elementary_level.pdf
    • https://cdn.shopify.com/s/files/1/0438/5823/1461/files/grammar_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/9195/1769/files/tetunawu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/gejazijosenoxijejakoman.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/nijibibetivedibezapixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zebegevuda.pdf
    • https://cdn.shopify.com/s/files/1/0440/4923/6118/files/4765881171.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/bobufur.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/26669957376.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/pumekaridinojuzeropipunar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/binoluso.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_off0000779c.bin
53880d9c7289e9f6e09cc5fee9ddcb868e97e5042de45da90efe30ec30a409ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x779C 5488 bytes
font_01_sfnt_off00008a30.bin
bed92cd39d5d835b742bbacd18bb2a01890f49915e42982930c496b0cb4c0e33
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A30 10592 bytes