Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4774647c4af3b52…

MALICIOUS

PDF

38.6 KB Created: 2020-08-05 10:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a2e607399ef9ecc8df7f2cecddc8d1d SHA-1: 8b99c1a90eb8f3af71f48c8c55d5cb35682eb0dc SHA-256: c4774647c4af3b52a4c7243e7614b0d5ab2856f5fa70d1236f40e87332a07558
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector at 'https://ttraff.ru/pify?keyword=carrier+water+cooled+screw+chiller+catalogue+pdf'. The document body, though heavily obfuscated, contains text related to a 'carrier water cooled screw chiller catalogue', suggesting a lure to disguise the malicious links. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.ru/pify?keyword=carrier+water+cooled+screw+chiller+catalogue+pdf
    • http://files.tkobootcamp.com/uploads/1/3/0/9/130969403/bagorozolomar.pdf
    • http://files.teethwhiteningmonterey.com/uploads/1/3/0/7/130775952/jititosojagunibikugo.pdf
    • http://files.briona.org/uploads/1/3/2/3/132302718/vaxapijumezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/20950624102.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/bivaloxazonopik.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0917/files/xidizesepode.pdf
    • https://cdn.shopify.com/s/files/1/0440/5883/7142/files/git_remote_add_heroku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8940/3810/files/xoxezetuvebukiteledibev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70277109097.pdf
    • https://cdn.shopify.com/s/files/1/0433/0323/9835/files/zubaburadinusupisejow.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1853/files/biblical_hebrew_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/8009/7687/files/zebugonetigamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9935/6324/files/wedibijufinixuxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/faxisolijaniselodaxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/1893421463.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_off000057db.bin
9277c5812b438258d7190864cd9f93365e9ae55e5db3d09aa8bbf319e949c3fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x57DB 5416 bytes
font_01_sfnt_off00006a53.bin
1714e48026f033e01a1160afdef39aec50e9d6e66c5f3715a859b43d460d260e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A53 10524 bytes