Malicious PDF — malware analysis report

Static analysis result for SHA-256 0537edc61566c5fa…

MALICIOUS

PDF

56.0 KB Created: 2020-09-06 02:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6a3713a3c2a626321c5273fac1fa3da SHA-1: a8658b1ac2b5a005212728707de5510a914ff94a SHA-256: 0537edc61566c5fa7c66c9900fd79d0c2f26dd7772ec9585a2674a32000dda26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious URL identified is a redirector that appears to be part of a link farm designed 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.link/pify?keyword=basotho+initiation+songs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/rurepe.pdf
    • https://cdn.shopify.com/s/files/1/0445/7309/8143/files/dewufatujarif.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/zuseni.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/14692634978.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/kebukekafovusumov.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/vugezajonulotajudomixat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/56159287592.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/fosigajoxiba.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/tofugetevadopuzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/zx_spectrum_basic_programming.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8784/files/50371795263.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f2e.bin
26fc769f8321a14a6790251ea40155bf6ab606a621723acf8afc9b5d68c18c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2E 4868 bytes
font_01_sfnt_off00008fc3.bin
bdb30e3257c264cec6f64c39e722089448551bce8440e72b2f90a10d9fcf5f0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC3 10392 bytes
font_02_sfnt_off0000b389.bin
96ab3042575e6db92b7bad1aac42ed8095504d59665b3326cf7857e97d54a14f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 18776 bytes