Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e6ce03c41a0207…

MALICIOUS

PDF

40.9 KB Created: 2020-08-18 21:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9688e6f397c360b8dc61d7da959c6cf SHA-1: 2359cb237a99898ef9612eb50347e16afc08e25b SHA-256: b9e6ce03c41a020741f4585875eab5a51125075b5df2dd1f58f473c55f26e97a
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous Shopify-hosted PDFs, with one primary link to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to disguise the malicious intent. The primary malicious URL is https://ttraff.ru/pify?keyword=online+android+studio+ide.

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.ru/pify?keyword=online+android+studio+ide
    • http://files.nosieyogi.com/uploads/1/3/2/6/132682892/fopasomapedole-logapudi-vasadibifum-witititag.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8088/files/darupifemako.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/41335717324.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/vapudolinojaninatulelez.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/23576531299.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/trill_luv_yakki_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/1917/3029/files/balancete_contabilidade.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/lofadosofevamososapusox.pdf
    • https://cdn.shopify.com/s/files/1/0433/5121/2200/files/27057772175.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/encyclopedia_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/asq_2_song_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lawup.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/fubafidozidofak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46824776831.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8744/files/merge_vertices_blender.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_off0000638a.bin
ef2f14876539a7ee1241074e5c9f0e409bd67a55d7e6ab484584abd3f42303d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x638A 4844 bytes
font_01_sfnt_off0000740b.bin
35f5ec864942b4dc83423243fb76957296013f3510ec28a6d43140576bc844a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x740B 10284 bytes