Malicious PDF — malware analysis report

Static analysis result for SHA-256 69819973275febea…

MALICIOUS

PDF

48.8 KB Created: 2020-08-07 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9af0c8dc2499091ef4e9801fe71d6a43 SHA-1: 4c897a07f6086bdc80665051863a525b8260ca63 SHA-256: 69819973275febea95d2484c7d6d4e0e1bfeaa27388443ee242f7e4ede5d5e47
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute content or lure users to various sites. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially harmful websites.

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.com/pify?keyword=aeronautical+study+in+annex+14.+pdf
    • http://files.bsa411.org/uploads/1/3/0/7/130775027/jugututoferuxoxipegu.pdf
    • http://vufegi.quebecmusiccompetition.com/uploads/1/3/0/7/130775129/depipawimujuwu_bugikedolezasav_vapibur.pdf
    • http://files.mallowkitten.com/uploads/1/3/0/7/130775373/7776110.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3104/4007/files/19146976969.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/tuxivoneronorubuvovudo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/perspectives_in_educational_management_and_administration.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/wikov.pdf
    • https://cdn.shopify.com/s/files/1/0431/6318/9405/files/15445509637.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/95742655135.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9018/files/98724205694.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/90325811480.pdf
    • https://cdn.shopify.com/s/files/1/0437/7637/6983/files/westminster_confession_of_faith_shorter_catechism.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/2020_audi_a4_cabriolet_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7235/5478/files/fenozenu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0386/files/80977798187.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006919.bin
634d5ba83a1c5626f4b19b6c56269ee0031d0de08cdbe9f8c40c0d48e14cc27b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6919 3620 bytes
font_01_sfnt_off00007627.bin
a8b10a9c25c21b1f9603ec713764999b69b2072fb31b8038de5647a3a147c4ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7627 5480 bytes
font_02_sfnt_off000088f5.bin
b6dfc8e32f2ec91a1f578915d03b4bba16506e1666060c10af9fd291ff589afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F5 14444 bytes

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