Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bc5aa2fc56fd7d…

MALICIOUS

PDF

46.6 KB Created: 2020-08-10 16:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6439fe24ef85cb637db0b85a4c27b20 SHA-1: 2c1156b2d8078da9eac281872fd25afb963d012b SHA-256: 55bc5aa2fc56fd7d7a0183445b27c8f67c15dcc98d2c888dca85f13634b64304
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for malicious content. No scripts were extracted from this sample.

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=tratamiento+absceso+cutaneo+pdf
    • http://files.montessorilawrence.org/uploads/1/3/2/6/132682758/xugoseg.pdf
    • http://files.crowfootguitars.com/uploads/1/3/1/3/131380616/falapim.pdf
    • http://files.ohmenergytech.com/uploads/1/3/1/3/131384568/funuzumixiwokop.pdf
    • http://xenenojif.zenithcounsellingandconversation.com/uploads/1/3/1/6/131606289/46a60.pdf
    • https://cdn.shopify.com/s/files/1/0433/2866/7816/files/vamabofimilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61051106257.pdf
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/lukupimilijuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/activity_diagram_in_uml.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/essential_idioms_in_english_robert_j_dixson.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/dojumexivelibulo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/xegud.pdf
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/automatic_control_systems_9th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/china_vietnam_war_1979_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0440/7430/3640/files/gedevezujazaritenowakip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38608120386.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/nadotorerovij.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_off000075f1.bin
a6ff7d094af6c0d7be408877e2b3bdc1cd30f75baf2968093ec5e3d67479599a
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F1 5356 bytes
font_01_sfnt_off00008805.bin
b5a35a2bc5638e983893f73d32406617042330d84213c6427c2ced1ce2c70fe0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8805 11024 bytes