Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81de93ca39e29c9…

MALICIOUS

PDF

65.6 KB Created: 2020-08-14 00:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8e6249fed7aeab6d9a8e14916f35051 SHA-1: 88a09b81a7030cca1cbe796a6e69e834ab4b265a SHA-256: a81de93ca39e29c945ed8e25589ebe6822a58c1dd25f54d9ef9691591bce1ae5
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, contains text related to religious prayers and the wkhtmltopdf tool, suggesting a lure to disguise malicious links. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=preghiere%20di%20liberazione%20dal%20maligno%20di%20don%20pasqualino%20fusco%20pdf
    • http://files.centrocha.org/uploads/1/3/0/8/130873870/7918256.pdf
    • http://files.jackmoline.com/uploads/1/3/0/9/130969818/luvujuvopesano.pdf
    • http://noxilo.doityourselfcustomers.com/uploads/1/3/0/8/130813612/6411340.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/62528415598.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6496/files/37370926368.pdf
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/gizuberiterajujebisejudef.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/nujiwibimeli.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/autophagy.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7573/files/laptop_acer_aspire_e14_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/organic_chemistry_brown_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/gimp_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/bexafapekuxokezeloviteref.pdf
    • https://cdn.shopify.com/s/files/1/0438/4843/3829/files/biology_neet_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/wemopedis.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/danby_premiere_dehumidifier_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b49a.bin
53308ec5beeafdd60a5b23738447d848b5fd01c9088c0d122cb31660a88fa2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB49A 5688 bytes
font_01_sfnt_off0000c7ac.bin
8188ff63e47d087a66071956a4d174180a45255a884c93ca90f616c5002e4b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 10408 bytes
font_02_sfnt_off0000eb1c.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 4324 bytes

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