Malicious PDF — malware analysis report

Static analysis result for SHA-256 f251248e8ea691bf…

MALICIOUS

PDF

51.4 KB Created: 2020-08-18 15:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3b273dad99405a269299fe2fd82d94 SHA-1: 996fa92ae041284f37943ad7014ec2f6616b1c80 SHA-256: f251248e8ea691bfdbf2c6a7d9ee4e21e438790074c92a0f2edd03c1cc1c4a45
152 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 identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=guided+tours+singapore+malaysia'. The document body, though partially corrupted, also contains this URL and references to 'guided tours singapore malaysia', suggesting a lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=guided+tours+singapore+malaysia
    • http://files.tigerterrain.com/uploads/1/3/2/7/132740805/didovifutiv.pdf
    • http://files.tieddownadventurers.com/uploads/1/3/1/4/131438759/24bfa0e8e9a9522.pdf
    • http://files.kkstechtips.com/uploads/1/3/1/3/131379110/vizotonixa.pdf
    • http://jitemixel.hosannaplattsmouth.com/uploads/1/3/0/7/130775677/60c244b83a.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4189/files/luziwopedegukurimuwusume.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/91066830817.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9711/files/91574476431.pdf
    • https://cdn.shopify.com/s/files/1/0433/2781/5833/files/95150612434.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5854/files/zoxutawepabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/45261637785.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2661/files/p90x3_lean_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0082/files/2813671557.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/jonefuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.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_off00008c1b.bin
360319c011e140a5945101936dd75a387edfd3de8ed2d4edd3c0f122297a9fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1B 5412 bytes
font_01_sfnt_off00009e73.bin
1aa2eed8cab2457d69663c86a8cd8ffd96884b46dd2f33070bca8af4a73bd90e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E73 9916 bytes