Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7fdf990650bc54…

MALICIOUS

PDF

36.9 KB Created: 2020-08-15 01:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b933ed0a303cebe112b86854d9af2b SHA-1: bccdcf6c9dda42b24fce6a3a0035019c25e8d4fe SHA-256: cb7fdf990650bc54c87f5ad18dbd2e16574690ce0dab9e749999a0d97c808dcc
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially obfuscated, contains text related to a 'Cogito watch user manual' and includes the malicious URL. The PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, likely for SEO manipulation or to distribute malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=cogito+watch+user+manual
    • http://wilimored.allinthestory.com/uploads/1/3/1/4/131483027/5877209.pdf
    • http://kegukuf.lege-artis.ca/uploads/1/3/1/4/131437919/534f3bdf4ddf.pdf
    • http://fabaki.sunriseandpinedesign.com/uploads/1/3/0/9/130969335/fulojamub.pdf
    • https://cdn.shopify.com/s/files/1/0437/5091/6247/files/78512470086.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/muxogilobesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/xamewozujonibovojofosa.pdf
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/comptia_project_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9027/files/flight_of_the_bumblebee_flute_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4629/files/75026410206.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/37232466833.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/occupational_health_policy.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/tekoneselip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0434/1841/9349/files/99029385467.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/make_believe_media_the_politics_of_entertainment.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_off000051bf.bin
b12ea84ef9cdc5098fa0051d94a2fbe78168b3bf3a63f360ee05950f19b43134
pdf-font-stream PDF embedded font (sfnt) at offset 0x51BF 5212 bytes
font_01_sfnt_off00006362.bin
4be76516344b5fa4290cbfc3cc556f91d0350bdc9faeaa4b079d8e6835cbf17f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6362 10396 bytes