Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b2c144b5726f57…

MALICIOUS

PDF

40.0 KB Created: 2020-08-06 09:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 025c36005f4ec8923a40ffa5d94f0308 SHA-1: 3579435ec8a45f2bc43362008f55833d434256b5 SHA-256: 05b2c144b5726f57c224130b019e91341c35672e95b7ab7c848066f9f0f92ca2
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, which is part of a link farm designed to attract search engine traffic. The document body, though heavily obfuscated, contains the same URL as the malicious redirector and appears to be a lure for users searching for specific content. No scripts were extracted, but the presence of a malicious redirector and link farm suggests an attempt to drive traffic to potentially 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.com/wb?keyword=rosetta%20stone%20level%201%20english%20pdf%20resuelto
    • http://files.lakecountryphoto.com/uploads/1/3/1/0/131070089/3902508.pdf
    • http://files.devinmgill.com/uploads/1/3/2/6/132695492/bcffeb90.pdf
    • http://files.manatsutanaka.com/uploads/1/3/0/7/130739450/411199.pdf
    • http://files.oldwisdomnewmoon.com/uploads/1/3/1/4/131406563/kesubosabob.pdf
    • http://files.virtualchip.com/uploads/1/3/0/7/130775231/xisawu_rironagobot_rulamazuwi_kinolokala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75815848510.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/97507059901.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/34600133473.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/buwuda.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/varuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/puziritotesokebate.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/27634999603.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3357/files/riseruxapavowiridutelixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/12568534050.pdf
    • https://cdn.shopify.com/s/files/1/0435/8782/9928/files/kolujejiwijizi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6745/5128/files/62414276121.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6094/files/xudixoxejaworofunanisen.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_off0000500b.bin
9ecc3575ef7e4a243301f3070ec427d8341f6df764d0050204599baa9f353817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x500B 3560 bytes
font_01_sfnt_off00005cf0.bin
f27b77a2dd6edab84b7e337d5da3d67af2abe0f7908c7131a45e0161ccca6757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF0 5420 bytes
font_02_sfnt_off00006f6c.bin
4793a77e45212feb0a227acfe08660acda6a923efdc0afe4aea99a3875ea7529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6C 10308 bytes

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