Malicious PDF — malware analysis report

Static analysis result for SHA-256 957762469a98b4e0…

MALICIOUS

PDF

54.3 KB Created: 2020-08-19 22:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd1875907346a993ff57e73a57c4ca15 SHA-1: cbac87b8038c236d6382c14fada6ed87a708f84c SHA-256: 957762469a98b4e03195c2ee2bc29286a2edff00447714888c5908049f36455e
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, suggesting a phishing or scam attempt. The document body, though partially corrupted, contains the text 'Jazz piano music sheet free' and the malicious URL 'https://ttraff.cc/pify?keyword=jazz+piano+music+sheet+free', indicating the lure used to entice users. The ML classifier strongly flagged this PDF as malicious.

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=jazz+piano+music+sheet+free
    • http://files.commongroundonthehill.org/uploads/1/3/0/8/130813730/47d69b5a0f9b.pdf
    • http://files.slodivers.com/uploads/1/3/0/8/130874067/juwowipabo.pdf
    • http://midufu.thepeaceseekers-persian.com/uploads/1/3/0/7/130739275/9e5fab7a0a1edaa.pdf
    • http://files.spartanburgband.org/uploads/1/3/1/4/131437445/3026560.pdf
    • https://cdn.shopify.com/s/files/1/0444/2321/7318/files/28661390801.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0358/files/40030714137.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4727/files/49274543586.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/86740142946.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9680354999.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/potikalekuzabesaxafolumi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/vejitaropoxeko.pdf
    • https://cdn.shopify.com/s/files/1/0437/8640/4000/files/delegation_in_nursing.pdf
    • https://cdn.shopify.com/s/files/1/0445/8813/8660/files/bd_chaurasia_download_free_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/26203986431.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/feloxajurudegixilejaparim.pdf
    • https://cdn.shopify.com/s/files/1/0432/3413/2131/files/portuguese_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/nadutojalanosezulifodal.pdf
    • https://cdn.shopify.com/s/files/1/0437/7798/2626/files/jump_math_grade_6_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008306.bin
d06c91c775e5b577424828c58e4a38e327d418847464088ec8ffa61cdea9eb7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8306 5260 bytes
font_01_sfnt_off000094bf.bin
95e7ef666349fe9d3c170fc3f442d653e79ff143c3ba8a2a49e3a8e455c0687a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94BF 9996 bytes
font_02_sfnt_off0000b747.bin
9cfb948b915a4694feeb7f8719f2b65905b0a58e2ed918074a610570d07e7249		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 16100 bytes

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