Malicious PDF — malware analysis report

Static analysis result for SHA-256 a278bac5150b4c85…

MALICIOUS

PDF

57.5 KB Created: 2020-08-01 17:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2b18a50193ff8dd1c85b46eba756f78 SHA-1: 12fe2b359f706216e984ae93053a6ed48c82892d SHA-256: a278bac5150b4c85a1910df7209fd65deb7af02b16fb6853a6373c55cf5ca7c4
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a PDF link farm. One of the primary links, https://ttraff.cc/pify?keyword=minecraft+gameboy+advance, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a coordinated effort to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=minecraft+gameboy+advance
    • http://files.fransinotirta.com/uploads/1/3/0/9/130969960/tijuweburupag_jerefubuvez_kiveloso_lotani.pdf
    • http://files.lynnwinchester.com/uploads/1/3/0/7/130740571/fubidejelolejor.pdf
    • http://files.boyscout507.org/uploads/1/3/0/7/130740124/puxesalu-sexiretivepuko.pdf
    • https://cdn.shopify.com/s/files/1/0428/8364/5599/files/90820824986.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/pitorogute.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofexunixepufatomubudabak.pdf
    • https://cdn.shopify.com/s/files/1/0428/0378/9991/files/3040306650.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/7164285832.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/pawow.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/lonuwuvewexumibopumufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/48384578055.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/tubamizozogusozuborokarer.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/28965852074.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/danazaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5716/8027/files/nigoxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/37955694073.pdf
    • https://cdn.shopify.com/s/files/1/0431/3881/0010/files/95792597219.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_off00009614.bin
34eec044265fe652fd519a8722526d0e7292a4c4eb2949427915dffe175c4e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9614 5228 bytes
font_01_sfnt_off0000a7c8.bin
d6c71f4dc96f0558138a0c1f8640a31f7ed9989f8ca06ef65b73db8ce671563a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C8 10296 bytes
font_02_sfnt_off0000cae9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE9 4324 bytes

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