Malicious PDF — malware analysis report

Static analysis result for SHA-256 8713e9126cc87b8a…

MALICIOUS

PDF

42.0 KB Created: 2020-08-19 19:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f52f1d12bb768c87b4d8934e416a74a9 SHA-1: be804ac9aefe7b5799494f723cfb71b18bb51f85 SHA-256: 8713e9126cc87b8abe7446aa41d15008501479d269332515521911fddde305bd
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link to malicious infrastructure, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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/pify?keyword=harvest+moon+back+to+nature+gift+guide
    • http://rerimed.jefflevineart.com/uploads/1/3/2/6/132681482/9962871.pdf
    • http://tiwafaso.harrisallen.org/uploads/1/3/1/8/131871479/6681620.pdf
    • http://files.ras.saintleoresidencelife.com/uploads/1/3/1/0/131070678/5654079.pdf
    • http://visadafeg.trmanagement.net/uploads/1/3/1/3/131379730/kebemijero.pdf
    • http://files.thebridgechurchli.com/uploads/1/3/2/7/132740917/accb51cec84a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/bufebowesadirajemupiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/71343441046.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/kiniluwejenaturobukiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/59016510041.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/ferivuvofuzakalo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/wuvemakapogiladiregoxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/suniradaratezu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/71546667561.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065df.bin
42be5ba6b12f00435bb240d038c894dcd8168c77bd45341589020096a7ede36c
pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 5532 bytes
font_01_sfnt_off0000789a.bin
5e0e581bc05d4c96a36016881fcbd692ac509502adaca052d246e7a349deffda
pdf-font-stream PDF embedded font (sfnt) at offset 0x789A 9980 bytes