Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a72a9ac9449b9af…

MALICIOUS

PDF

45.1 KB Created: 2020-08-18 23:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3143289a5e396ce9fd81856ff9d7b511 SHA-1: 8ac0d662692b44ab7e9e9b19e90264a37f31dd19 SHA-256: 8a72a9ac9449b9afc4d9978177ecb8b7d2f5d88cbfc08a7734b508cf472a3def
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a CV template, which is a common lure for phishing attacks. The ML classifier strongly indicated maliciousness. The document body contains the URL 'https://ttraff.com/pify?keyword=cv+template+free++docx' which is a known malicious redirector. Additionally, the PDF contains a large number of external links, many hosted on shopify.com, likely part of an SEO link farm to obscure the malicious redirector.

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=cv+template+free++docx
    • http://nimiwumun.makingestatement.com/uploads/1/3/0/7/130775364/wudexiburaza.pdf
    • http://files.janeantonovich.com/uploads/1/3/0/7/130776673/5664869.pdf
    • http://files.allisonroseentertainment.com/uploads/1/3/0/9/130969110/7963697.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
    • https://cdn.shopify.com/s/files/1/0428/8947/8307/files/1464137952.pdf
    • https://cdn.shopify.com/s/files/1/0429/8679/9257/files/vujidorexagojirewivamu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3709/0211/files/gunus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0443/9290/6918/files/60173794455.pdf
    • https://cdn.shopify.com/s/files/1/0440/3222/9541/files/bourne_shell_scripting_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0447/4375/3879/files/midute.pdf
    • https://cdn.shopify.com/s/files/1/0445/6821/5716/files/amino_acid_metabolism_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3852/3047/files/single_line_text_art.pdf
    • https://cdn.shopify.com/s/files/1/0438/5678/9664/files/95205214997.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/24449111210.pdf
    • https://cdn.shopify.com/s/files/1/0440/7413/9813/files/fisuginifufud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/apple_cider_donut_nutrition_information.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_off00007371.bin
6b5c37986b903c2ce411d11a662319272f01d70bdc79f4ea8be9f79c1d66a7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7371 5156 bytes
font_01_sfnt_off000084ec.bin
502720edcaeb391d18202b8afebc0a7f6e6b64e4a589fb0e9645ce4368f703ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84EC 10004 bytes

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