Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c31de6bd1563ddc…

MALICIOUS

PDF

42.0 KB Created: 2020-08-09 23:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a04782e202d05f8481ce76822ceb1bd SHA-1: 32bb62ed40ee12e35ae78fa08e1262050de696db SHA-256: 9c31de6bd1563ddcc65f4b3aac3130dd57b81af772e543641d5bde73398fbfc5
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc' which is flagged as a malicious redirector, disguised with a keyword related to 'bambuterapia'. The document body, though heavily obfuscated, contains this URL and other links to Shopify domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF structure includes numerous external links, consistent with a phishing or scam delivery mechanism.

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.cc/pify?keyword=curso+de+bambuterapia+pdf
    • http://files.rodeoqueenofhearts.shop/uploads/1/3/1/4/131408170/dopasorol.pdf
    • http://files.shirleyphillipsartist.com/uploads/1/3/1/6/131636655/dezafozewopolalabo.pdf
    • http://vuzokad.wildthingzdogmushing.com/uploads/1/3/0/8/130813528/5e6e4399.pdf
    • http://files.beccairvinpottery.com/uploads/1/3/1/0/131070872/6982965.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/nemazesabe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevadijuxirefasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8295/6443/files/doxemudoxaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/beer_brewing_process_flow_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/10127731865.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/80923819236.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/kemikaviruvolig.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/11594562054.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/gaming_pc_build_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/kepeguburibe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8771/5742/files/22561317687.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/9340516526.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_off000062c0.bin
5346bec11ba56071c544a0b50351222263996c1ce10de049febaace21531b067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C0 5200 bytes
font_01_sfnt_off0000744b.bin
2b076956a83220dabc302ae808c24b777729787cbdde806e25848f899dd1dd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744B 11544 bytes

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