Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f175f7d52f305b…

MALICIOUS

PDF

44.5 KB Created: 2020-08-11 07:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4fd7ec8a52857693f44f802544cccb1 SHA-1: 2719c180d55d0bc2cc7a2dd0593b21e75cc2b131 SHA-256: d1f175f7d52f305b77bda7e6f3e05b475d95cb5d011bd57da2bd2c843b260796
152 Risk Score

Malware Insights

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

The PDF document contains a prominent link that redirects to a malicious URL, disguised as a tool to convert PDF to Word. This is supported by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic firing and the presence of the malicious URL in the document body. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of outbound links, suggesting a broader campaign to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=mengganti+file+pdf+ke+word
    • http://files.nadiacorson.com/uploads/1/3/0/7/130739996/246d72e320aca6c.pdf
    • http://makek.4wcustomleather.com/uploads/1/3/1/0/131070374/2493847.pdf
    • http://files.archelps.com/uploads/1/3/0/8/130813301/9320513.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/bukolimojebenixugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/lafojuginuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/7525/4937/files/mekoxikenokutem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/destination_b1.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/brahmanda_puranam_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/gisesilirader.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/8458881439.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/protected_areas.pdf
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/july_2020_calendar_with_holidays.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062aa.bin
d916a263e4361ea35e8bc04fc98e27f96fda00073631a5f7aaaf2e5bd73a1119
pdf-font-stream PDF embedded font (sfnt) at offset 0x62AA 4980 bytes
font_01_sfnt_off000073bb.bin
fd3bd86fc3d09e3818fb9a5cc0494c56104b44e195924f9e62280e8f143ec65c
pdf-font-stream PDF embedded font (sfnt) at offset 0x73BB 10744 bytes
font_02_sfnt_off000097a0.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x97A0 4324 bytes