Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff518210842ace7…

MALICIOUS

PDF

70.1 KB Created: 2021-01-09 17:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58a03ccdaf6bc7c4a3b602fbe6440247 SHA-1: 37d961fe8adaee875ed040e92894229f5444dd9d SHA-256: cff518210842ace789cb74c0186332fc1e8280d3d5395c31260dbaec9e9ae4d7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is designed to lead users to malicious sites, potentially for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=mr+boston+bartender+guide+pdf
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f8b37e447c2e.pdf
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f91997f3fb83.pdf
    • https://static.s123-cdn-static.com/uploads/4410674/normal_5febcf7d8091a.pdf
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5f98703db1a38.pdf
    • https://static.s123-cdn-static.com/uploads/4499351/normal_5ff66fe088d38.pdf
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fa4c04e021cc.pdf
    • https://cdn-cms.f-static.net/uploads/4472783/normal_5fb2f5927ce24.pdf
    • https://cdn-cms.f-static.net/uploads/4414336/normal_5fc036b71af32.pdf
    • https://cdn-cms.f-static.net/uploads/4411683/normal_5f9d90cc7c6b0.pdf
    • https://static.s123-cdn-static.com/uploads/4458614/normal_5fde005663ca7.pdf
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5feba88a3a023.pdf
    • https://tepunejor.weebly.com/uploads/1/3/4/6/134636279/e443f14ab3dd005.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a0b61e3-d05b-4869-a263-240d5bc3f7c5/space_frontier_2_last_level.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_off0000ca8c.bin
bdb406f6fab9753bb88dcc4788ad9d52f873c2f06dac74407e61295241937ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 5324 bytes
font_01_sfnt_off0000dcb4.bin
0d9fe11318acc6bee60e7a0c04c40551a8bb1823277991e2c1da9f63e7481183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 2452 bytes
font_02_sfnt_off0000e76b.bin
21fd618b062ff11423e4202752d0b9aa173f8c2411e956c82a48de27194706e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 10532 bytes

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