Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebeb00e2dd3a6c5…

MALICIOUS

PDF

44.7 KB Created: 2020-08-19 12:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c90b5178c4a91b29f4937d05d259abe4 SHA-1: ddb518c388aa0516be8cde0033238ca50fded4d3 SHA-256: 5ebeb00e2dd3a6c53ef95141aabee85750701f1526bd04f8fd9b6c4352783004
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to 'CVS Caremark prior auth form for testosterone', aiming to trick users into clicking the malicious link. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning and traffic 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.com/pify?keyword=cvs+caremark+prior+auth+form+for+testosterone
    • http://files.lifton.ca/uploads/1/3/0/8/130813714/munosutewolemej_vulabujego_vewutif_nujawagujin.pdf
    • http://files.beyondorganicsgarden.com/uploads/1/3/1/4/131454034/xozaje-bokosepikopobib.pdf
    • http://files.modernhomebuyers.us/uploads/1/3/0/8/130874102/795e1446412afea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3828/5725/files/graphing_slope_intercept_form_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/taluwusazufiwenonavejow.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/79989835494.pdf
    • https://cdn.shopify.com/s/files/1/0428/5703/7990/files/51834913917.pdf
    • https://cdn.shopify.com/s/files/1/0440/3465/4358/files/cabling_network.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/96570045694.pdf
    • https://cdn.shopify.com/s/files/1/0452/3019/4845/files/rules_for_assigning_oxidation_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/2808964949.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/43257021703.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0432/8446/3784/files/pneumatic_clamping_system.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_off0000709d.bin
02ae4eac7e01939a32cba9b2834ebba72c6c88ddbfbb7c006ad0b24ae8306f35
pdf-font-stream PDF embedded font (sfnt) at offset 0x709D 5252 bytes
font_01_sfnt_off00008257.bin
24d0c41f73b1e0e647f03911462ea894f5a7268082bfeecfa2c3c88de8e85e4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8257 10288 bytes