Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef3e51cd4037152…

MALICIOUS

PDF

40.6 KB Created: 2020-07-29 21:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c11542cc7e9e51af74f64edb6fce2b8 SHA-1: a01cbfcd421a7b5852d27411617bdb291d98e173 SHA-256: 7ef3e51cd4037152abf3a2b226e198ca04534b5a46870e50462522005c58dc26
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, suggests a lure related to downloading a book. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content. 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=remedial+biology+book+pdf+download
    • http://files.winealongthe101.com/uploads/1/3/1/4/131453484/97c11683.pdf
    • http://files.konnektable.net/uploads/1/3/1/4/131413718/7680545.pdf
    • http://files.cameronvocalmusic.com/uploads/1/3/1/8/131871494/2094648.pdf
    • http://files.northwestharvestchurch.org/uploads/1/3/1/3/131381602/45fe44fc405.pdf
    • http://files.bcotmaths.com/uploads/1/3/1/3/131398234/tuvugedi.pdf
    • http://files.bcotmaths
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/jatamitometuxezaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/93479134768.pdf
    • https://cdn.shopify.com/s/files/1/0441/1306/8184/files/70801502116.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/dorinedegamubiva.pdf
    • https://cdn.shopify.com/s/files/1/0435/8347/1771/files/20914949561.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0057/files/sakigatifesenefu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0027/3830/files/fadakumukejabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/wadufajitaburilifoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/42072291750.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/29646423456.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/77267373718.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_off00005f33.bin
1d6f00fbc3ed736590d0e46706c087a260c37cac1b078d54c2ea426822acfc92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F33 5200 bytes
font_01_sfnt_off000070e7.bin
bacb5fad016a74e835c251e3e7a12ea57452456741f0dc90d6b9e2d57ec9cec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E7 10092 bytes

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