Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42539b8f295317b…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 07:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f3e9e3b9b827ca688e79e2fbb832372 SHA-1: fe7d91cdd7e0faeac9938b55e9313c812c5e2977 SHA-256: d42539b8f295317b23266fbb1065aec48fe751d4d84c139d7de2cf70b8c43295
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which are hosted on Shopify and appear to be part of a link farm designed to improve search engine ranking. One of the primary links, 'https://ttraff.ru/pify?keyword=ace+care+plan+pdf', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious content.

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=ace+care+plan+pdf
    • http://files.socialjusticemclc.org/uploads/1/3/2/6/132681080/5ec6a1192ee38e7.pdf
    • http://dorutuves.drlindseynd.com/uploads/1/3/1/3/131398140/0589d0a4d.pdf
    • http://wutezi.zndaughtersdance.com/uploads/1/3/2/7/132740214/xalota-kigibuka-kapupavobut-manir.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0939/files/infix_to_postfix_converter.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/drdo_ceptam_09_tech_a_previous_papers.pdf
    • https://cdn.shopify.com/s/files/1/0438/2762/6134/files/tinomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/15311914639.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/short_story_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/sleeping_beauty_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/2165/5464/files/algebra_maths_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/80955173561.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/86900290771.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/12672594481.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3085/files/tazefileraneju.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/xazobo.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_off0000647b.bin
7d35565df79e85ee232cdb6e0cf4fbc2cb56f4f1e6226aa08fbeb1525c86fbea
pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 4960 bytes
font_01_sfnt_off0000756e.bin
9396f2ae6651780d0ff894cef75d142bbbb689a4744b2cd36e1f11ef72cb412d
pdf-font-stream PDF embedded font (sfnt) at offset 0x756E 11344 bytes