Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cde099ee9a8131…

MALICIOUS

PDF

33.5 KB Created: 2020-08-31 13:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87e6e1da3ea4278057d7a14947eb3f7 SHA-1: 7ee323214b1810570bc08d65c1a83c8ab705f7db SHA-256: d9cde099ee9a81312f2e07ca5a39b8b53be8b38530e8a967e5fefebcdf01bc94
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains the string 'Achievers b1 answers' and the malicious URL, suggesting a lure to a phishing or scam page. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, likely for SEO manipulation or to distribute 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=achievers+b1+answers
    • https://cdn.shopify.com/s/files/1/0433/8630/6710/files/35285931071.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7347/files/seattle_dmv_hours.pdf
    • https://cdn.shopify.com/s/files/1/0434/4043/9446/files/12435042908.pdf
    • https://cdn.shopify.com/s/files/1/0464/0948/2408/files/poker_cheat_sheet_black_rain.pdf
    • https://cdn.shopify.com/s/files/1/0430/3241/2311/files/nexedizekupovuvi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/6th_grade_algebraic_expressions_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/zufegidogeduzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/17546009780.pdf
    • https://static.usrfiles.com/ugd/01e791_c821dbb8a9a04ca497d67365a15a8e28.pdf
    • https://static.usrfiles.com/ugd/8cbfce_a399d329c2d94d909554d4201fefd1b2.pdf
    • https://static.usrfiles.com/ugd/d54300_672419033667466ca6382aa960dc2dc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_da5cbadefd1b449c8b1031826a4d9e80.pdf
    • https://static.usrfiles.com/ugd/87d215_79321a89e4e1440eb3b3c770a662d565.pdf
    • https://static.usrfiles.com/ugd/0c268c_efab6e9b8ff745298cd2a87bfcca635d.pdf
    • https://static.usrfiles.com/ugd/b8c837_eed78987074f413aa1a7f32ec3bee87a.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_off00004689.bin
609e7f80d04a628622e670910551c4ed48a4cc08284c8c4e4c622a4c8f1c3919
pdf-font-stream PDF embedded font (sfnt) at offset 0x4689 5188 bytes
font_01_sfnt_off00005842.bin
493a1491e98e912c9af01462ba77f296572710acf29c3af20f20f9dc38660e85
pdf-font-stream PDF embedded font (sfnt) at offset 0x5842 9712 bytes