Malicious PDF — malware analysis report

Static analysis result for SHA-256 73992807d6b30837…

MALICIOUS

PDF

39.6 KB Created: 2020-08-04 06:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c51bb279c51160a6c87d7f37643467 SHA-1: 50cf5f8eee4709557b82999e878787e154f5e8ba SHA-256: 73992807d6b3083713edff4b3e86c72ac1e25b23e148ea5f140ffa5d4ece9346
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to 'cctv installation guidelines'. The ML classifier strongly indicates maliciousness, and the presence of numerous external links, many hosted on Shopify, suggests a link farm designed to lure victims. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document title and a malicious redirector.

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=cctv+installation+guidelines+pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • http://files.bonvivantgourmets.com/uploads/1/3/1/4/131452935/8320689.pdf
    • http://files.aizhenwangart.com/uploads/1/3/1/4/131406060/pekuzaxuvud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0254/1726/files/fosexilozimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9566/files/zefebogisadenadalagomuvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/bowesavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56802730071.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4166/files/72330247473.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/tal_dorei_campaign.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1671/files/dizififixiduz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/xinekadeluzelujudib.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/pufibupijuwu.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_off00005fbe.bin
10bd97f5cf598edd82c39b22e125e64ae8b316b9ce08895f51081d28fbf6ee99
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBE 5192 bytes
font_01_sfnt_off00007188.bin
f3e7bf0e107ad1387b8dd149785685cc09354591a410a9d45649bfa1296a7337
pdf-font-stream PDF embedded font (sfnt) at offset 0x7188 9532 bytes