Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a05ca29ead09411…

MALICIOUS

PDF

42.4 KB Created: 2020-08-08 21:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f3031fef0fc568ceb30829121b4fafb SHA-1: 0eff032950af60f84b1de591b51ae2a2f96aa3c3 SHA-256: 0a05ca29ead09411048957275e815f926d52998879ed95d3706ac2f6a423ab2f
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'fake certificate'. The presence of numerous external PDF links, many pointing to potentially benign Shopify URLs but some to unknown domains, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

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.cc/pify?keyword=certificado+de+preparatoria+falso+pdf
    • http://files.xenyodame.com/uploads/1/3/1/4/131409009/viwopi.pdf
    • http://files.phazetheory.com/uploads/1/3/1/4/131454109/70fb882e3.pdf
    • http://files.attentivesafety.com/uploads/1/3/1/4/131408056/lamidilipukatuborasa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/augusta_jail_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lubogalevomiwubojaxijafax.pdf
    • https://cdn.shopify.com/s/files/1/0434/1484/7655/files/geekvape_aegis_legend_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/88340601725.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1959/files/97742364021.pdf
    • https://cdn.shopify.com/s/files/1/0432/0457/5387/files/95299042891.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/ashiq_2_songs_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/42608212879.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/kasaxodif.pdf
    • https://cdn.shopify.com/s/files/1/0432/4691/1643/files/python_bar_plot.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_off000064a9.bin
ac7e1330095a4163c7bb49d5d2a08f2c9580dbcc02455174884a8c8257be6475
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A9 5052 bytes
font_01_sfnt_off000075e5.bin
6149b530eb2b4cabe90d630c99150d9f2372a48a691c499e40b5eb0124e8d80d
pdf-font-stream PDF embedded font (sfnt) at offset 0x75E5 11228 bytes