Malicious PDF — malware analysis report

Static analysis result for SHA-256 6152b601f7ae03e6…

MALICIOUS

PDF

45.7 KB Created: 2020-08-30 14:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78971061fbffcd4e8e8774948157e8a0 SHA-1: 784b30b449ece66260aa08ffd2f61b5b4046c5b7 SHA-256: 6152b601f7ae03e6e1b2276c1f8b141fdc9add7a039fa898309e7ab7c95254d7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/wix?keyword=127+hours+movie+free+download+720p`. This URL is presented within the document body, disguised as a movie download link, and is accompanied by a visual download button lure. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=127+hours+movie+free+download+720p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/vipumiwetug.pdf
    • https://cdn.shopify.com/s/files/1/0452/4458/0002/files/fish_handbook_for_biological_wastewater_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0438/2775/7216/files/simples_nacional_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/vafifuvub.pdf
    • https://static.usrfiles.com/ugd/e42ee3_f5f1507fe987402ab725b4c93edf973a.pdf
    • https://cdn.shopify.com/s/files/1/0437/8473/2829/files/kanipofekipavelotexub.pdf
    • https://cdn.shopify.com/s/files/1/0437/0907/1513/files/it_is_difficult_questions_to_answer.pdf
    • https://static.usrfiles.com/ugd/5b9a87_8b9d4a002f104f619cec0da3c1b670bf.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_5711e0d522b04d6cadf72c7806508b2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_8afe13fc864541279414b3f8f116622f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a817384f4a3c4bf39c1c9ee3421b6721.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f476750cf7845febaeef278ee60f847.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007374.bin
3b731fa5a254df96077ff1e00473b5b65aa351984e3021d7a798684c9c6e3a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7374 5744 bytes
font_01_sfnt_off000086f6.bin
77e530297788d1ff0780b8aa4a6950da58d6dcae648ddc6d8ce47788637e55ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F6 10312 bytes

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