Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96c8d0358319b0c…

MALICIOUS

PDF

46.7 KB Created: 2020-08-19 00:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef5ef397f28349b5cef4448136704c04 SHA-1: e641f215b95d1ba02f27be754fa3cd3149a7cca6 SHA-256: c96c8d0358319b0c90a995b2119dd532eb0ab05720f2aa0596d1c37db2229f1a
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'citation machine acs format' and the malicious URL. This suggests a phishing or scam attempt where the user is tricked into clicking the link, likely to download further malware or be directed to a fraudulent site.

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.ru/pify?keyword=citation+machine+acs+format
    • http://jokaj.amberyouragent.net/uploads/1/3/0/8/130814328/nunum.pdf
    • http://zonekoj.markgordonglass.com/uploads/1/3/1/4/131437130/4922518.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/wordly_wise_3000_book_8_lesson_20.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/duxavojowisegojanejobivow.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/66458034053.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/32802104380.pdf
    • https://cdn.shopify.com/s/files/1/0428/1955/1388/files/mezemomok.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/wow_classic_shazzrah_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/rolimoxedim.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/office_xp_service_pack_3.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7991/files/zexizupezimewegiranutewa.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_off00007b55.bin
7d7053608990e5e8228ac50bff1593d247de5e2f543e328d76abc5124745e16d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B55 4996 bytes
font_01_sfnt_off00008c21.bin
5b2531e710be4b814566a564065d2917120ef7a3bf4d6a685dcef1a09c2a68bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C21 10076 bytes

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