Malicious PDF — malware analysis report

Static analysis result for SHA-256 3425a00bc9af5f92…

MALICIOUS

PDF

43.2 KB Created: 2020-07-26 09:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c13d7bea9e0ec3b8522cab27c16a75d SHA-1: b13d310f1855f879624eb2337467f7c1d1a25e54 SHA-256: 3425a00bc9af5f92f8bbdeeff74d3f3a43873475ce25522e5d5f0239c768d023
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary redirector URL, ttraff.ru, is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the link farm and malicious redirector are strong indicators of a phishing or scam attempt.

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=2d+and+3d+shapes+worksheets+year+2
    • http://files.hyperventila.com/uploads/1/3/0/9/130969986/3923061.pdf
    • http://files.fpyc04furysoccer.com/uploads/1/3/2/3/132303269/f909798a.pdf
    • http://files.myartisticdentist.com/uploads/1/3/1/4/131453214/ribane_vasilabofeb_dotowifixusiw_zejezurugo.pdf
    • http://files.columbushardscapes.com/uploads/1/3/2/7/132712080/9127580.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/87675144302.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/14069161540.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/90984205969.pdf
    • https://cdn.shopify.com/s/files/1/0434/6042/7928/files/69439410301.pdf
    • https://cdn.shopify.com/s/files/1/0428/4222/6854/files/viverejires.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/nobugolasefa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6521/3089/files/79609423605.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0437/1218/4474/files/75741999290.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/didoletasekafakizetevena.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/32291387730.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c62.bin
8e799a9d8359b34a56da103c30749f14ec032be4d7573dcd104b85ad7d87cd29
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C62 5212 bytes
font_01_sfnt_off00007e11.bin
330ac546e6622e88024d504def2400e392e72f3b3df2d03325ed67289d7ce93e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E11 9924 bytes