Malicious PDF — malware analysis report

Static analysis result for SHA-256 af551fc0eecbea52…

MALICIOUS

PDF

52.6 KB Created: 2020-08-09 15:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8a6243a2e68cac94d5b0ee8a8345d5d SHA-1: 102a4d7e27b9222f4c8e63e4f3302789c5932cbc SHA-256: af551fc0eecbea52caa59b4375025231222a5dfc12d3a7409b34650e097550c8
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body text, though partially corrupted, includes the same malicious URL, indicating an attempt to lure the user to a potentially harmful site. The ML 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.com/pify?keyword=les+cellules+souches+pluripotentes+induites+pdf
    • http://files.zambiasafarihunting.com/uploads/1/3/1/3/131379820/wutogibabuxapopewaki.pdf
    • http://fopup.allinclusivetennis.com/uploads/1/3/2/7/132712615/moxulipofemoxe_zijiwibonam.pdf
    • http://files.mathsict.shenfieldlearning.com/uploads/1/3/0/9/130969704/mizumimugumoxu-xisuzapotej-tikek.pdf
    • http://files.cognoscereconsult.com/uploads/1/3/0/7/130739126/lexedasiwipe_kosop_murerumofe_jixirojofutali.pdf
    • http://fediwaze.bethelpresby.org/uploads/1/3/0/8/130814229/4062326.pdf
    • https://cdn.shopify.com/s/files/1/0431/3822/0181/files/meluxiwolezumivubejelod.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/sukakabutules.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/bahria_town_karachi_balloting_results_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/posemu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/40034876448.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazutorigixasozesilax.pdf
    • https://cdn.shopify.com/s/files/1/0436/4566/5433/files/9867661582.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/jijogigodetebevilobif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.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_off00007baf.bin
1a5c068f2c4f3d603b6bcb1e9e2e8b32f077c1e0ae1961a94efdcad1fda034fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAF 4856 bytes
font_01_sfnt_off00008c28.bin
ee21037c20fbaf82cd9564a271dae2aa38e3236de02f5f6172df639cda8c7f42
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C28 13364 bytes
font_02_sfnt_off0000b550.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 4324 bytes