Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f13b3de544d026…

MALICIOUS

PDF

41.6 KB Created: 2020-08-20 06:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30d54f56cb1e6668cec43e00be3500a6 SHA-1: 5c849e87d21f98607c4164333cbd70f2f51b2de0 SHA-256: 52f13b3de544d02624861cedcfd743e0aa6caf841fb61cb703c5632f0a4a3419
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains text related to linguistic terms, likely serving as a lure. The presence of numerous external links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to increase visibility and traffic to the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=difference+between+connotation+and+denotation+examples+pdf
    • http://zazibi.teamacorntriathlonclub.org/uploads/1/3/2/8/132815002/wejekeli.pdf
    • http://files.sproutsmyanmar.com/uploads/1/3/2/3/132302863/giburapudiga-dojowul.pdf
    • http://files.greenspacegardens.net/uploads/1/3/1/4/131454040/linejufanuba.pdf
    • http://files.goodsweetearth.com/uploads/1/3/0/9/130969254/7442661.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/wuvobevumimadilalurer.pdf
    • https://cdn.shopify.com/s/files/1/0447/8536/9239/files/apsrtc_ngos_bus_pass_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2115/files/megofanikexakimimuwu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9517/files/16694747232.pdf
    • https://cdn.shopify.com/s/files/1/0428/8456/3110/files/gazejepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/85525673140.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/bifivexeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/motubawolax.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/gate_2020_instrumentation_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/builders_html_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/16092083092.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000647a.bin
7d4d48ad00427e205d69a256293f9b2c80cdda30fc87e9f4c9ce25dd8bfc9e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647A 5600 bytes
font_01_sfnt_off0000777b.bin
6f7f9c21b4e614a91f10a21943fef16fcdc0b6a22d411e43f4725be955f79a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777B 9892 bytes

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