Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4bf84d906f89ac…

MALICIOUS

PDF

46.1 KB Created: 2020-08-20 20:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab32dcd333e63a916d5b39406264b9b3 SHA-1: bdedfd7377a8236dc213b62fca370e7f3f6aa6bf SHA-256: 6d4bf84d906f89ac9c2dd5e20b3e27910ecbf54283fbb37e4bee6db26d38dbef
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=iso+internal+audit+checklist+template', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=iso+internal+audit+checklist+template
    • http://xunixivi.ozgurince.co/uploads/1/3/1/8/131856543/tuguzutanoxok-jafis-lutirikatenuvon.pdf
    • http://penanan.ardentacres.com/uploads/1/3/1/0/131070036/2289482.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8891/1267/files/biology_lab_manual_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6657/files/24427997055.pdf
    • https://cdn.shopify.com/s/files/1/0432/8246/4928/files/saxebujixipofamedupow.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2085/files/nuwuga.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/gawudagadawomigikivufosat.pdf
    • https://cdn.shopify.com/s/files/1/0432/6670/3516/files/26603872615.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/booster_internet_wifi_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/24410457837.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2550/files/vurelomezelogexeveto.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/minecraft_how_to_teleport_to_bed.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_off00007712.bin
f35b5ca31af6810a307db78e28c2f108eaa67da4b20d4c1e901c3df6aeb5923b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7712 5316 bytes
font_01_sfnt_off000088ef.bin
9ec34b22a863564440d0a78c5c3c8c42c1f43f21544a4257f78a4efc2a744687
pdf-font-stream PDF embedded font (sfnt) at offset 0x88EF 10252 bytes