Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f62b935cfb137b4…

MALICIOUS

PDF

42.6 KB Created: 2020-08-14 02:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab61f956e9f502c3ae96c763da46c9e4 SHA-1: 493db178a06f535384f89f9edac0d93d97dce008 SHA-256: 7f62b935cfb137b4e9b2d4d95d81ab621fcd7c74319592a53fc4ec4f77f7c5f6
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to traff.ru, indicating a malicious redirection attempt. The document body, though heavily obfuscated, contains the same URL and a reference to 'index match max google sheets', likely a lure. The presence of numerous links to external PDFs, as noted by PDF_SEO_LINK_FARM, suggests a link farm used for SEO poisoning or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=index+match+max+google+sheets
    • http://kojakufu.wingerlab.org/uploads/1/3/2/6/132695569/6254079.pdf
    • http://files.azwatersolutions.com/uploads/1/3/0/7/130739833/0d094605d7740c.pdf
    • http://nanafizal.thefrenchnurserycapetown.com/uploads/1/3/0/8/130813095/1c8aa2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/vaduredanakerimiwovegil.pdf
    • https://cdn.shopify.com/s/files/1/0440/3740/6870/files/wimuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/52251408743.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/solicitud_de_tarjeta_de_credito_banesco.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/41171219709.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/arpeggios_for_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/88334520268.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/mifokonosuwimatimuroseza.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/91849907601.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/wamorolenamofomon.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/vamarinixowef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/75254308741.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/validity_test.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_off000058a3.bin
acf8a6a7d3cd49d3f18990eb86f167ee1e782adf59de9bb6a7eaac1a5388c407
pdf-font-stream PDF embedded font (sfnt) at offset 0x58A3 5004 bytes
font_01_sfnt_off00006973.bin
b65e50d6a126582ce10e572e45f43ea3d1b9ee7c70c1bd6ba97d79beba85a68f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6973 11316 bytes
font_02_sfnt_off00008fab.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAB 4324 bytes