Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf0f020eabd1848…

MALICIOUS

PDF

43.6 KB Created: 2020-08-10 23:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbe3644ab663aca1a2f5d7b02f697de0 SHA-1: 9fd49036db21884d07f0e091348291181303f075 SHA-256: ecf0f020eabd1848bf8a542bf6e79b9c277a604a2755562d6e91e61c45b99a57
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though partially garbled, includes the same URL and text suggesting a salary slip lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bulletin+de+salaire+simplifi%25C3%25A9+pdf
    • http://files.kansashistoryday.org/uploads/1/3/1/4/131409498/5611fbe666822.pdf
    • http://files.norrisfbc.org/uploads/1/3/1/6/131636725/jefokutuvitivom.pdf
    • http://files.grundmeyerleadersearch.com/uploads/1/3/1/6/131636990/sifixoj_jutixepipi_bevasagipaxuja_sivosukisozi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/jilumarozojuvoros.pdf
    • https://cdn.shopify.com/s/files/1/0437/0661/3912/files/96790482223.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/72744408780.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/21494893801.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/98405262820.pdf
    • https://cdn.shopify.com/s/files/1/0434/6626/0642/files/14175876998.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/suvolalusuri.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/test_de_raven_descargar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/pdf_reading_kindle_paperwhite.pdf
    • https://cdn.shopify.com/s/files/1/0435/8730/5629/files/50955201176.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_off000067ca.bin
d1204fb7d60c95e249c1610eeb54e0aaf186347582654b4042beb88eb1ba0bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CA 5376 bytes
font_01_sfnt_off000079b9.bin
7b6ea5504afdbdcbad61cbb3b64acacbce49c65c801d77a7ee941eb6f25307ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B9 12164 bytes

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