Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25fe77779f2594d…

MALICIOUS

PDF

78.0 KB Created: 2020-07-18 04:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1592989605b5dcf82c55adef929ad53a SHA-1: bc4257431210abaa775668251a4201901241c92e SHA-256: e25fe77779f2594dea9703a005386c187ca501d7698ce76f3e519cc42579a935
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure.

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/wb?keyword=capital%20budgeting%20replacement%20decision%20examples%20pdf
    • http://files.det13ksc.com/uploads/1/3/1/8/131871852/8b423d2355c84.pdf
    • http://files.lushmetals.com/uploads/1/3/0/7/130739603/temasawotiwiborovi.pdf
    • http://files.drfelixroom26.com/uploads/1/3/1/4/131453998/risaxeput-balewubamifunis-xuranitaru-savipagezaj.pdf
    • http://files.divorcecoachingandconsulting.com/uploads/1/3/0/8/130874518/bejam-soselovorifat-tekumubobup-powidonuvewadar.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3301/files/77673469986.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/62236968874.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/37222907112.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/99802323207.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/pazoxudatenipur.pdf
    • https://lotuwekozu716611446.files.wordpress.com/2020/07/96858549035.pdf
    • https://kiguvibisi.files.wordpress.com/2020/06/vidanirova.pdf
    • https://rizukajo.files.wordpress.com/2020/06/betagota.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/loxakasafasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/dolusaginikoguwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9087/7339/files/kofesogefetige.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/xotowiwuzisiluwep.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/22030228798.pdf
    • https://cdn.shopify.com/s/files/1/0429/5072/1699/files/xotewilufasoponululojoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.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_off0000e6ab.bin
8da8e70d3a3a285ba51b4482ef3593a07b79306dcc9c525056a26fa645058b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5588 bytes
font_01_sfnt_off0000f98d.bin
db3967fa4f79f637f2d1ad7a8e839698179743d5ae844a3abdcc95a5262809f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 15608 bytes

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