Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f9455546792b23…

MALICIOUS

PDF

39.6 KB Created: 2020-08-20 05:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db437930213d9a7a0978ea66463e3979 SHA-1: 32450aa8ca5d69d4920e3d9d5675e9d1fbe889db SHA-256: 06f9455546792b2341f9b122fe75ad994a1c4a63ad66d17fe1cc9061c698d283
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector. The document body, though obfuscated, contains the text 'microcellular rubber sheet hsn code' and a URL that matches the redirector, suggesting a lure to trick users into visiting malicious sites. 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.cc/pify?keyword=microcellular+rubber+sheet+hsn+code
    • http://files.naturallytamar.com/uploads/1/3/0/7/130739269/puxoxebu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/denetosuvil.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/wosenamamuda.pdf
    • https://cdn.shopify.com/s/files/1/0434/6645/7254/files/991_es_plus_calculator_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/harbor_breeze_remote_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7768/8743/files/tabubomipitivaxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1337/3084/files/d_d_3._5_barbarian_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0448/1299/2674/files/understanding_psychology_kasschau.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/22215389160.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/31303613571.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/galesabizuweguxum.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/37002864284.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_off00004ecc.bin
1a4058563a858cdf5740a962ba36a48b12cd390cb380a8f554bb727092080004
pdf-font-stream PDF embedded font (sfnt) at offset 0x4ECC 5172 bytes
font_01_sfnt_off00006052.bin
e6aab4cc7bac436f18067cb897e460e0fd18f25e22b96e7b6be8a65f08dc7ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6052 15692 bytes