Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a44c10e4196db04…

MALICIOUS

PDF

41.5 KB Created: 2020-08-05 15:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b3019c137d0da061c70a5319bf860fc SHA-1: 99426cde3f34d4187017975c0e67beef3a5e222f SHA-256: 6a44c10e4196db04a93fa8619e85a6b63601d378e23207ec2278aa3f7dd21ea3
194 Risk Score

Malware Insights

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

The PDF document employs a social engineering lure, presenting itself as a free PDF annotation program to trick users into clicking a link. This link, https://ttraff.com/pify?keyword=free+pdf+annotation+program, redirects to malicious infrastructure, indicating a phishing or malware distribution attempt. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm used to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=free+pdf+annotation+program
    • http://files.bexleyvoice.org.uk/uploads/1/3/0/7/130776343/sufamimosivaki.pdf
    • http://files.bobsearle.net/uploads/1/3/0/9/130969354/wimuw-xutoxugaremi-togebefo.pdf
    • http://files.littlehandshomedaycare.net/uploads/1/3/1/3/131383478/2121861.pdf
    • http://files.fairmounthardwarelumber.com/uploads/1/3/1/8/131871674/1603663.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5360/5273/files/13714431884.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1944/files/nofar.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/91056645017.pdf
    • https://cdn.shopify.com/s/files/1/0432/0401/8336/files/xavuledariw.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/14154983748.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/lawakipavi.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2264/files/alibaba_business_model_canvas.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/91123523117.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/xikozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/zovisezizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/bemepoge.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/19784224302.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_off00006527.bin
ba464196ba17703b177f342ecdc3b06700b3826685b69bd1a7fe10a322fb7409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6527 5104 bytes
font_01_sfnt_off0000767a.bin
ecd64433770f0ca88a0ff43ed405261d79cea73403ecc47877d8120a3e82cc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767A 10180 bytes

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