Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b6fa5fa63bada2…

MALICIOUS

PDF

53.2 KB Created: 2020-08-19 04:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c85cf7b5fe0dcc28ede9a8b7572262cc SHA-1: 7dd2ec15acc2eace21fb4d1eaa9e77ea45feeec4 SHA-256: 42b6fa5fa63bada2bf7b9edc07cb62996d3b9e85d8300c3959cb36d137479b65
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic firing indicates that a link within the PDF redirects to known malicious infrastructure via 'ttraff.cc'. The document body, though partially corrupted, contains text related to medical guidelines, likely serving as a lure to disguise the malicious intent. The primary attack pattern involves redirecting users to malicious sites through a deceptive document.

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.cc/pify?keyword=american+diabetes+association+gestational+diabetes+guidelines+2018
    • http://files.devonbatemusic.com/uploads/1/3/1/0/131070212/sigikodina-sozimikaledi-seziguselixu-gexawaj.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/82375443144.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2931/files/dugelul.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/podejiwatinujefifukizo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4343/files/25637043852.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9936/files/cambios_fisiologicos_y_psicologicos_durante_el_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/xokazawaloravexupikorez.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/video_games_history.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demajez.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_off00008f8a.bin
d511e23005a373753527581a71e958cb63c5ddfd1f4bbde25616a063c79f2e5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8A 5908 bytes
font_01_sfnt_off0000a37d.bin
eece5ca93bf08dfc75cf823e2d1ba78fe2cac06faae5be2b05b4e4e3028642e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA37D 10616 bytes