Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e807014fa95a26…

MALICIOUS

PDF

44.1 KB Created: 2020-08-01 11:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e07db92aba49228145029754a72e0af5 SHA-1: f25e6bbc4a5fd1dfb155aa27d484b915f3756474 SHA-256: b1e807014fa95a26ae8b180fe5b2313966bf12738000ce85fb07522f7f3c2263
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack. The document body itself is heavily obfuscated and contains embedded URLs, reinforcing the malicious intent.

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=mips+if+statement
    • http://files.desertskydoodles.com/uploads/1/3/1/3/131379168/399083.pdf
    • http://files.shopurbanhandmade.com/uploads/1/3/0/7/130739603/fuzusavedo.pdf
    • http://files.almoraproperty.com/uploads/1/3/0/8/130814129/pipuwaxivutoradix.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/22529908554.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6637/files/17359550005.pdf
    • https://cdn.shopify.com/s/files/1/0437/7228/0981/files/38894402563.pdf
    • https://cdn.shopify.com/s/files/1/0439/9228/5342/files/58724071241.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5031/files/18478343364.pdf
    • https://cdn.shopify.com/s/files/1/0431/1672/4386/files/89617011340.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/zamuteb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/14834360688.pdf
    • https://cdn.shopify.com/s/files/1/0429/5370/3590/files/26730997124.pdf
    • https://cdn.shopify.com/s/files/1/0436/4858/1782/files/vawedojijenabada.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/36435127481.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_off00006331.bin
6c05c4cee1e3ba000b7f81f05fed67e8f0e0b2a873426f8a3fbb773c2fa1909e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 4924 bytes
font_01_sfnt_off000073f1.bin
36162c0fb594e92382678d0ec5327280a0fe785398ac438276bba62f09ec1c43
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F1 15296 bytes