Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9157797054f616…

MALICIOUS

PDF

39.2 KB Created: 2020-08-21 17:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65049750652646b0790e4adc0ef6540b SHA-1: fd9265b27ace99080d51703bf9ea4d73f13ff621 SHA-256: 0b9157797054f616404a5ee90b153676ee420d8841d680116dc3285b3eb5fe8f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm pointing to known malicious redirector infrastructure. The document body text and embedded links suggest a lure related to embedding PDFs into Excel, likely to direct users to malicious sites like the one found at ttraff.com. No scripts were extracted, but the high ML score and critical heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=embed+pdf+into+excel+sheet
    • http://files.verdeenv.com/uploads/1/3/0/7/130775565/9990441.pdf
    • http://files.riversidepopupgallery.com/uploads/1/3/1/3/131380825/697a03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9791/5545/files/bepuripozitenik.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/generalized_anxiety_disorder_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/96766526582.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/36883503176.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/gebedobidebodedefazogugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/fonamukilode.pdf
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/38192667563.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/dasuzebazowufukulozikemeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/10320831758.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/29302619491.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_off00005c5a.bin
0721595b9499f68672d934664747de5f3e7df1f1944fc8516ec9eaeb15da88a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5A 5256 bytes
font_01_sfnt_off00006e14.bin
b47c2f692cff5c15586a32952e9743a4a7f3a06544d0c089e1feb755841a6953
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E14 10024 bytes