Malicious PDF — malware analysis report

Static analysis result for SHA-256 613c6240bbc04939…

MALICIOUS

PDF

47.0 KB Created: 2020-07-17 20:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9755d3ba748a7ee14f050ac8bf8f2bd SHA-1: f4a07f70386aefcacdf93acf43d4aa850808f714 SHA-256: 613c6240bbc049390858996b2bd31c7fc140dfe4e0177b34ca805cff9be208e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm of numerous external PDF documents, with one link pointing to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious redirector and a large number of outbound links suggests an attempt to direct users to harmful content or to manipulate search engine results.

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=remeha+quinta+pro+115+boiler+manual
    • http://files.stlukemt.org/uploads/1/3/1/6/131606968/144518.pdf
    • http://files.centennialconcrete.org/uploads/1/3/0/7/130740207/fogupokow_zerarozozefon_dibivamo.pdf
    • http://files.retreatatprairiewind.com/uploads/1/3/1/3/131379118/lujos-fanarejabu-mudiva-lizogij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nojalefise.files.wordpress.com/2020/07/28744517409.pdf
    • https://begogimem.files.wordpress.com/2020/07/8099091164.pdf
    • https://levejaru304222751.files.wordpress.com/2020/07/maruwo.pdf
    • https://gomubefibi.files.wordpress.com/2020/06/bozewebavosadi.pdf
    • https://jekokugin.files.wordpress.com/2020/06/sonuwagejabuguvixosu.pdf
    • https://wajowobosub.files.wordpress.com/2020/06/mitenepuguwam.pdf
    • https://wijikud.files.wordpress.com/2020/07/zeguzojebosufusigefer.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/62749702312.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/waxekikelurugagopujusavog.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/50143114933.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/79576824795.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/jibimewaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/98719300517.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/rolaxapodireto.pdf
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/19437151212.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/rawufuwejuxepuda.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_off00006fbe.bin
1dd84cdb9ecb54cfdc0bc9b3a7c7f81ba9fb26176d2e60e23b50cc95cd36849c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBE 5212 bytes
font_01_sfnt_off0000814c.bin
d315631624845d767e8eefb1c373e4e883a0eb50fe06d181f9ec891ada23e59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814C 2048 bytes
font_02_sfnt_off00008a29.bin
690be1685b376bf1776dd54454934753a9c2df14c6d95398fa7db9553fc4df1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A29 10664 bytes

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