Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5d7abb2cb711ae…

MALICIOUS

PDF

51.3 KB Created: 2020-07-21 17:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 59883afa1aeb3a26b06cb0e0fe63bc4f SHA-1: baea8af3ee8c30d6f4594e69748c1f2555b4a45a SHA-256: 4f5d7abb2cb711aea24791eaafef86c2af1c430890d33b78e05e954ae5297e9c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded links, identified as a PDF SEO link farm. One of these links, 'https://ttraff.cc/wb?keyword=relative%20dating%20in%20archaeology%20pdf', is flagged as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious infrastructure, likely for subsequent exploitation or phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.cc/wb?keyword=relative%20dating%20in%20archaeology%20pdf In PDF document text
    • http://files.mskhor.com/uploads/1/3/2/6/132682570/fewogedawox-xabuguj-dajelenudunexo.pdfIn PDF document text
    • http://files.jeremybraden.com/uploads/1/3/2/3/132302859/sovak-jitixowebirew.pdfIn PDF document text
    • http://files.nelliecalkins.com/uploads/1/3/1/4/131454501/jefidav.pdfIn PDF document text
    • http://files.trbtoolsofthetrade.org/uploads/1/3/1/4/131406258/695242bf8587.pdfIn PDF document text
    • http://files.lesliearnoldarchitecture.com/uploads/1/3/2/6/132695460/5263232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/32632539359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/17071823567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/ximexarigidezeg.pdfIn PDF document text
    • https://xupakumub.files.wordpress.com/2020/07/3107613262.pdfIn PDF document text
    • https://wixujeki.files.wordpress.com/2020/07/nawapi.pdfIn PDF document text
    • https://fepozanidimu.files.wordpress.com/2020/07/50201756366.pdfIn PDF document text
    • https://fewabod.files.wordpress.com/2020/07/18277073917.pdfIn PDF document text
    • https://xupapinir.files.wordpress.com/2020/07/18702274502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/27540211285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6209/1163/files/1390657752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4044/0471/files/14741008787.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5993/6421/files/xorelibodosobex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/fatuwefolonuwuwubosukuzem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B91 5196 bytes
SHA-256: 66712d6b500d4334bbd7c354d490e64cc43fc4643ec407f3a409ff28833898ca
font_01_sfnt_off00009d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D40 10076 bytes
SHA-256: e19f3110e54b834fdfbc0eb3523b64efc2e9ec09e6dec5a0ec655e1c1e8b7fec