Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f020c5ef5a3bf02…

MALICIOUS

PDF

40.3 KB Created: 2020-08-01 17:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6758325f12f0f8ed8079dd61151061d9 SHA-1: 4835f3d4703f47d21db137670b1984d5eff46259 SHA-256: 5f020c5ef5a3bf0270101b9b9e2ff4b3d4185da17b5e2b450f201eb79d8a8979
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.com/pify?keyword=arduino+blink+led', suggesting a lure to a malicious site. The presence of numerous other PDF links points to a link farm strategy, likely to improve SEO for malicious content or to distribute malware.

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=arduino+blink+led
    • http://files.clonbonnyns.com/uploads/1/3/0/8/130814007/nozugekoxinolexemed.pdf
    • http://files.elenalourenco.com/uploads/1/3/0/7/130740017/2134571.pdf
    • http://files.harborlandscape.net/uploads/1/3/1/4/131411688/lapitume.pdf
    • http://files.cityofnewhall.com/uploads/1/3/2/8/132815220/poxinixevo-rulirizotago-pavugigifodog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1298/8821/files/37399248847.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/64080478438.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/76114184327.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/6617084096.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/34368307483.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/kofibukemitewefuzipolebax.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/87498371573.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/49658351521.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1369/files/75561443730.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/75001781908.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/tusomexirebuleloparozexav.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_off000060f8.bin
326f778ab1e43655f31b220043faa04f125a1f4f963992a195b9f0c461a38344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 4624 bytes
font_01_sfnt_off000070be.bin
694d2c60522f5eedf0a5a6a2c85464414c5a4d0123d06a13b7f6138721825523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BE 10772 bytes

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