Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ff2e2b94fe124c…

MALICIOUS

PDF

52.4 KB Created: 2020-08-16 21:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab833c00a9126a8d9ad7af38a0ca5904 SHA-1: 1a08d0a4296fb48591aaf545fa3345deddefc8d6 SHA-256: 04ff2e2b94fe124c5c2887acdc2b739985d0ecc9ba851f2e07b0fe9b397092b1
154 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'online c compiler android' and a URL that appears to be part of a link farm designed to drive traffic. The primary malicious URL is ttraff.com, which is used to redirect users to further malicious content.

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.com/pify?keyword=online+c+compiler+android
    • http://lanopuf.nickrosencutter.com/uploads/1/3/1/4/131453645/kuzuwinor-wimudori-rejugig-bikij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/fatufufamuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/8506/9478/files/kunerotun.pdf
    • https://cdn.shopify.com/s/files/1/0435/5499/6383/files/webpage_to_extension_firefox.pdf
    • https://cdn.shopify.com/s/files/1/0444/6345/6423/files/all_full_form_list_of_computer_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/0549/0846/files/encyclopedia_of_world_history_peter_stearns.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/15564690360.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4556/files/43307520913.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6939/files/93237605642.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/giwokabadeluseposa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fupibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/negoda.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_off0000909e.bin
70f1f6bc81f0e6568858c055f36bee6b54468b4f654670a38515023e8b6a14f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x909E 5068 bytes
font_01_sfnt_off0000a1b9.bin
c9c9a3f298cd2254741826f61416f2d2ca70b0130b51646ade08113841b76e8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B9 10220 bytes