Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a6d74e86abc2ee…

MALICIOUS

PDF

40.9 KB Created: 2020-08-14 13:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4a3b5c0d75ab10f4367943792ae854 SHA-1: f2166efeeee71949e9c7fb58e0b9926c6be62884 SHA-256: d1a6d74e86abc2eeecdd89955763712f6f784a9ecc4542acece5ec5db0a72e1b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many of which point to external resources. One critical heuristic firing indicates a malicious redirector link, and another identifies a PDF link farm. The document body, though partially corrupted, contains text related to 'Adobe acrobat pro direct link', suggesting a lure to trick users into clicking on these links. The primary malicious IOC is the redirector URL, which likely serves as the initial stage for delivering a payload.

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=adobe+acrobat+pro+direct++link
    • http://zuraduxi.photographybycarrie.co.uk/uploads/1/3/1/0/131070786/jomazoxurune.pdf
    • http://files.leniquecawelcome.com/uploads/1/3/1/0/131070483/4c21544bad8f21.pdf
    • http://files.diannesk9connection.com/uploads/1/3/2/6/132682471/sesox.pdf
    • http://files.scfsoftballclub.com/uploads/1/3/0/7/130775223/kugefapelisoxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/stardew_valley_wild_plum.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/networking_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/24371828721.pdf
    • https://cdn.shopify.com/s/files/1/0438/0724/4450/files/74657859516.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/50719099307.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/didifawogokitagefinod.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/71042181903.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/30008880138.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2085/files/key_informant_interview_consent_form.pdf
    • https://cdn.shopify.com/s/files/1/0449/7784/8488/files/the_canterville_ghost_summary_chapter_wise.pdf
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/koranarenurutivosajop.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/gorivifowakoliwibivumuje.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_off00006149.bin
31695539dfe3ee0abf7c9ed81a96db364d52fc59f0e388adb4aa2ff4f4f1b8d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 5084 bytes
font_01_sfnt_off0000729c.bin
89bc835648b72d3e4321f5bb6fe150c837b6cbd64774e501895f3660e73fa6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729C 10572 bytes

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