Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f62d138b48f994f…

MALICIOUS

PDF

43.4 KB Created: 2020-08-20 13:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4dd5ab684e4a8bf949565b6f97390cd SHA-1: 9df23291a34e69baf986d66f835247403687418b SHA-256: 9f62d138b48f994f609dbf977e7d386c7bd64bc34ab81feeb8dd46f29e45a2db
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=bwv+998+pdf+guitare+allegro+pdf'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy, likely for SEO manipulation or to obscure the final malicious destination.

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=bwv+998+pdf+guitare+allegro+pdf
    • http://files.insideoutoutdoors.com/uploads/1/3/2/7/132740463/29e3cf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/nabard_bank_exam_study_material.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/duvojujebuvimemejafuju.pdf
    • https://cdn.shopify.com/s/files/1/0454/3918/9142/files/mokoroditu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/tofakokiwizulif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2679/files/zarodelivukabilelewepa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/66516071304.pdf
    • https://cdn.shopify.com/s/files/1/0435/0361/6165/files/29696067797.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/54529151658.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_off00005fe2.bin
73d9a9596cdce7565b3d7ebbd337b613976070af895fdd29ef82e9c849671f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE2 5580 bytes
font_01_sfnt_off00007300.bin
30d25d9dc302ac3e369236bed913274a231cf5f5abad354aa4d1ed7c4230e3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 14616 bytes

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