Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2789f3d2d328a2…

MALICIOUS

PDF

38.1 KB Created: 2020-08-01 17:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 044d18ab2eaf5d0e1552eaac7144bdfc SHA-1: 2a2cde45e91866230089137c8351e3d93702f528 SHA-256: db2789f3d2d328a2fe2ff9768aad6d1b2f9e9ff112d6c09b5a49b3804a9c6e00
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to Shopify domains hosting PDF files. This is indicative of a link farm or SEO manipulation tactic. One URL, https://ttraff.com/wb?keyword=merge%20pdf%20pages%20into%20single%20page%20, is flagged as a malicious redirector. The ML classifier also strongly indicates maliciousness. No scripts were extracted, and the document body was unreadable binary data.

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=merge%20pdf%20pages%20into%20single%20page%20\(not%20single%20file\
    • http://files.bcell.org/uploads/1/3/1/4/131437276/1671908.pdf
    • http://files.thequietcone.com.au/uploads/1/3/1/0/131071137/xezerufi.pdf
    • http://files.leslieslanguage.com/uploads/1/3/1/4/131406108/2027395.pdf
    • http://files.unklemikesplace.com/uploads/1/3/1/4/131409909/be404.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jufozigazagapuji.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/zigolokonufexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/10568903514.pdf
    • https://cdn.shopify.com/s/files/1/0429/7274/1791/files/gimugiwidosusewa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/gufumifunefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/zivagunogewakoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3315/0118/files/55337570614.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/82023660853.pdf
    • https://cdn.shopify.com/s/files/1/0431/5329/3469/files/32495399900.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/farefemukepinakovidozil.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/rikunawaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/55131765153.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_off00005669.bin
acad835e6a6974325787c9254b2805f04b45d8818ec14d717b2479b941a1150a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5669 5368 bytes
font_01_sfnt_off000068d7.bin
e12289349e4b45086eacf8ba2ab2cee0c09fa2ce5af75ad852fe8423af5f60d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D7 10324 bytes

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