Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88517909e85b403…

MALICIOUS

PDF

44.9 KB Created: 2020-08-07 00:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f0c031bfb4afb68bb40e6e84294b07a SHA-1: 6e7e26ea0d6059470a770c07c2760ce1c29afcae SHA-256: e88517909e85b4039c0baf0d0c466003515aa5100788ec4aae9e7e580787c01c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though corrupted, suggests a lure related to a user manual. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a phishing attempt leveraging a seemingly innocuous document to redirect users to a malicious site.

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/pify?keyword=tchibo+cafissimo+classic+bedienungsanleitung+pdf
    • http://files.myludingtontherapy.com/uploads/1/3/0/7/130775554/9747077.pdf
    • http://files.contrastmetalworks.com/uploads/1/3/1/4/131438313/lixaku-kesik-sitaz.pdf
    • http://files.genxtraining.com/uploads/1/3/2/6/132681145/vadiwiwuza.pdf
    • http://files.jefferyedoherty.com/uploads/1/3/1/3/131380058/1610684.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0433/2473/5643/files/sejimetipubewumuvodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/zusatulef.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/64742045035.pdf
    • https://cdn.shopify.com/s/files/1/0434/8474/1798/files/benebimureguzogeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/vamosagaremumodin.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8792/files/28083291752.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/remit_to_address.pdf
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/safapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61053474184.pdf
    • https://cdn.shopify.com/s/files/1/0430/2798/8634/files/bandon_dunes_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29331550606.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/86005380241.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dee.bin
31d7af849bd92553bbc352c4e0c1661f5202935190ed66823f8597faa3357a3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEE 5560 bytes
font_01_sfnt_off000080ba.bin
6c5510a532ed00146e1bc333a185ab674f49cb3115d64e88a549a2d7d3538ae7
pdf-font-stream PDF embedded font (sfnt) at offset 0x80BA 10932 bytes