Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dc640b523bbe3d…

MALICIOUS

PDF

41.9 KB Created: 2020-08-06 05:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6b92ce7cc9b4616d60968a637f8d06c SHA-1: 324511ec870f967141fc551bb1222a4d5883e22a SHA-256: 21dc640b523bbe3d2cdbbe9c4486179c8a53fa5c7d29967cf03be9fdc17fe467
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to 'ttraff.com'. The document body text, though partially corrupted, suggests a lure related to a memoir PDF. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a link to known malicious infrastructure, and 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely for SEO manipulation or to host further 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.com/pify?keyword=the+thrill+of+the+chase+a+memoir+pdf
    • http://files.counselor-adam.com/uploads/1/3/1/4/131408970/9729241.pdf
    • http://files.ofcrimsonindigo.com/uploads/1/3/0/7/130740517/wobafofir_bojajifefurisi_fosopo_polubuzakijal.pdf
    • http://rumalone.redroomonline.com/uploads/1/3/1/8/131856372/8161050.pdf
    • http://files.mohicounseling.com/uploads/1/3/1/4/131453870/7534153.pdf
    • http://files.urbancultureinstitute.org/uploads/1/3/1/4/131437147/zexadupedi-vezefeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2189/files/pirebebom.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/18740052113.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/74617710230.pdf
    • https://cdn.shopify.com/s/files/1/0432/1047/3633/files/rugemukag.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/90741991647.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/41008973285.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/32772906373.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/97505311031.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/23501163490.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/suwapewuzuxedomatevamom.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/fumolizibirupa.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_off000065ed.bin
2b34e080a1c3db372bd37b7275244e40ce0756fca333478e3b6996fb264e282f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65ED 5344 bytes
font_01_sfnt_off000077ec.bin
5eba408077fb3abecb8a8c48fb72bea517311506c4f752f164e9614c9daecf49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EC 10224 bytes

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