Malicious PDF — malware analysis report

Static analysis result for SHA-256 571fb9aec4b08109…

MALICIOUS

PDF

48.6 KB Created: 2020-07-24 20:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34c740a5bbdc79b19fdf2e3212bf3fd2 SHA-1: d02e0a9df1b01c55a4510902a628b65769d5f75e SHA-256: 571fb9aec4b081090c1034b9f2b90ac60dfbada9d054473cb6a9943724dcd9e0
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm, with numerous links hosted on Shopify domains, likely to obscure the malicious intent and potentially for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious sites through deceptive content, disguised as a calculator tool.

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=convert+to+rectangular+form+calculator
    • http://files.madisonhaines.com/uploads/1/3/1/0/131070523/af3fa172c25964e.pdf
    • http://files.jimhoneygardens.com/uploads/1/3/1/3/131380848/8ffaa85733.pdf
    • http://files.apriljonesms.com/uploads/1/3/1/6/131637257/mutoxefub-wenisufimiwev-wotixijiro.pdf
    • http://files.petcardia.com/uploads/1/3/0/8/130874025/2951857.pdf
    • http://files.elderjacknielsen.com/uploads/1/3/2/6/132681066/1162302.pdf
    • http://files.madisonhaines.com/uploads/1/3
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/vobaxavovobusitugubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/kibanisometegojis.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/10723654091.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/33182198180.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/jetorote.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/nisugikujovugoxejozozuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sogogetuxupoxex.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/bimadobasevatizubitojes.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/defitexodutexagevagile.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/begotusavoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/7751/6955/files/84824294847.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_off00006c26.bin
ff0ded42d5863a44e962d22874221cd2faf03aa5f215806c5271325ccd939b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C26 4940 bytes
font_01_sfnt_off00007cee.bin
1d586eaa9d1dc6fda48d3889c3ed42ccd343f582694eea88d0dd076f0805d1f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEE 10452 bytes
font_02_sfnt_off0000a05c.bin
aba6d7228e0fcc42341ee09250d9598a413f48202077e5963e65f524ed209447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA05C 16080 bytes

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