Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f51469e583eef5…

MALICIOUS

PDF

108.5 KB Created: 2020-08-10 09:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 349c6d5effa62ea778cdf95306569521 SHA-1: 3ce0e67b7e076e20bd7146f23ca4004974c5c4b4 SHA-256: 90f51469e583eef50592d12d71c4327788408fc64f8e6efd448ceb0360878740
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to SEO poison, with a primary malicious redirector URL. The document body, though heavily obfuscated, contains the same malicious URL. This indicates the primary goal is to redirect the user to malicious infrastructure, likely for further exploitation or phishing.

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=encyclopedia+of+african+american+popular+culture+pdf
    • http://files.lowcountrymodela.org/uploads/1/3/0/8/130813979/4935308.pdf
    • http://files.mskhor.com/uploads/1/3/2/6/132682570/fewogedawox-xabuguj-dajelenudunexo.pdf
    • http://files.peter-de-groot.com/uploads/1/3/2/7/132741555/4352612.pdf
    • http://jitaxu.cassowaryday.org/uploads/1/3/1/3/131380213/2550908.pdf
    • http://files.scstagelighters.org/uploads/1/3/1/4/131412558/609404.pdf
    • https://cdn.shopify.com/s/files/1/0433/6582/6719/files/tetagepolagor.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/kuruwolutesepozen.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3852/files/sebevurejomuwaxukas.pdf
    • https://cdn.shopify.com/s/files/1/0440/8151/2613/files/bpsc_cdpo_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/iphone_device_name.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/sebow.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/nivutawuji.pdf
    • https://cdn.shopify.com/s/files/1/0436/7374/7609/files/guzovanikunudumupeteloka.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/zelegowoxetexezezuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/causation_in_criminal_law.pdf
    • https://cdn.shopify.com/s/files/1/0452/0319/4007/files/vusabatuz.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_off00016e01.bin
8c2e0829e162528af158c47b070e7fe15758b7b2dfe7a33413df24b0a841b3da
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E01 5180 bytes
font_01_sfnt_off00017fa2.bin
fa105e713017387919ed6dff84baec8b6e638f2bb8b8bc7f08515efb33eb5ccf
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA2 10720 bytes