Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a77efba4cdd3e58…

MALICIOUS

PDF

39.1 KB Created: 2020-08-20 00:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f68fb799b9ce47f670a0cbccd2ee5a3a SHA-1: eb0f67bbbfadb0d19ccba2ae758b42565fa0dafc SHA-256: 8a77efba4cdd3e58cab5cdce0348c65d0363ae530eb0e3dbfeac9df70001bb40
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, indicating the document's primary purpose is to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The document body text is largely unreadable due to encoding issues, but the presence of the redirector URL and the link farm heuristic strongly suggest a phishing or scam campaign.

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=give+direction+worksheet+pdf
    • http://files.newbethelrolesville.com/uploads/1/3/1/1/131164312/mupifebase_kizefazinu_xexowupukolimi_fonebaforaw.pdf
    • http://files.nt-307.com/uploads/1/3/2/3/132302735/lojusifo-niwadoz.pdf
    • http://puzege.phisigmapidavis.com/uploads/1/3/1/3/131379730/sujipijelenewurex.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/75699129917.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/tomikedud.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/woduludekela.pdf
    • https://cdn.shopify.com/s/files/1/0432/1781/3661/files/adversus_haereses_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/beaverton_school_district_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/acidity_and_basicity_of_organic_compounds.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/makozazesefewumuko.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/dajusosiwemukuvo.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_off00005b32.bin
21ad4ec84a42013e6a9ffc546f14dbdb92e324be712db77b19ccab83390a6bf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B32 5248 bytes
font_01_sfnt_off00006d27.bin
131311bf3655c171fcf188d6b70ec92186c50411abaa04a4839fc72694675a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D27 10192 bytes