Malicious PDF — malware analysis report

Static analysis result for SHA-256 5855a3698bca5750…

MALICIOUS

PDF

45.4 KB Created: 2020-08-20 11:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d6d77f2861e81140a3aa449b1a79e13 SHA-1: 2aa4250cd2ab8e10cd2dd26c845fbef072f7750d SHA-256: 5855a3698bca57506c6254429bf61046f4533c0260046178952a49098a95dc65
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm pattern, with numerous links to external PDFs hosted on domains like 'cdn.shopify.com' and other suspicious subdomains. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via these links.

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=sp+sp2+sp3+hybridisation+pdf
    • http://files.straystreetstnr.com/uploads/1/3/2/3/132302970/doribukoz.pdf
    • http://files.bymichaelangelo.co.uk/uploads/1/3/1/3/131379724/62c46a21aae18b.pdf
    • http://jasora.prmendoza.com/uploads/1/3/0/9/130969744/34c45f.pdf
    • http://wugofine.beebellaphotography.net/uploads/1/3/1/4/131454696/jifuletu.pdf
    • http://files.rakhmaloveandharmony.org/uploads/1/3/2/7/132740435/3962776.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2133/files/pharmacy_letter_of_intent.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/20315533953.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/virezinitiku.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/88668843001.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/50778066535.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4512/files/vapuzetilolagop.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/gozofizajez.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/semukere.pdf
    • https://cdn.shopify.com/s/files/1/0431/6708/8800/files/94324292491.pdf
    • https://cdn.shopify.com/s/files/1/0437/9043/4455/files/ashrae_standard_15.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/kerekusegurajodepugonove.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/downpatrick_primary_school_inspection_report.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_off0000729d.bin
fc55cb39bd4b3e9a4e2d4df4e26b0942396bf617f152acc8e9555977b5ae7434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729D 5736 bytes
font_01_sfnt_off00008611.bin
9ff47a81a13056639b22dff1e543e2fcd7c43047fd6a011939f0294fea44e1d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8611 10048 bytes

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