Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bae632c95f6ced…

MALICIOUS

PDF

52.3 KB Created: 2020-08-22 22:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa6c98df0f0120727ef8aa18d28abd64 SHA-1: c008ea467bbfc5295fad090130d740e8066d9681 SHA-256: c0bae632c95f6ced7876fbe83bcc6da2070b346ff87dd2763c93c5f10714113f
152 Risk Score

Malware Insights

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

The PDF contains a prominent link within its body text that, when clicked, redirects to a malicious URL. This link is presented as a download for 'Counter Strike 1.6', a common lure for malicious content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier 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.com/pify?keyword=counter+strike+1.+6++free+online
    • http://files.sarahfranconyc.com/uploads/1/3/0/8/130815014/mexumiwetiliz.pdf
    • http://files.hammerheadfleet.com/uploads/1/3/1/4/131455680/4544729.pdf
    • http://files.madbaglady.com/uploads/1/3/2/6/132695732/xuwaxat.pdf
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/wetuwuxisedawubadilarux.pdf
    • https://cdn.shopify.com/s/files/1/0448/0620/9702/files/business_case_study_example.pdf
    • https://cdn.shopify.com/s/files/1/0439/1128/2843/files/brihaspativar_vrat_katha_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0758/2106/files/industrial_revolution_inventions_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/kronos_4500_time_clock_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/48648806105.pdf
    • https://cdn.shopify.com/s/files/1/0430/6701/5329/files/take_me_away_a_secret_place_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/zuvupikadefogofibujat.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/jupuvedivubem.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/dojudatej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a11.bin
d0a6bd507ba43e2c9e31daf0d03115432900743d0f97ba299693fce6f8a01d3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A11 4756 bytes
font_01_sfnt_off00008a5b.bin
1fd22ad6af09a893eea5e6a73c383ca01e1ea1d4c16c9b78a66ebcf6de991075
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5B 10764 bytes
font_02_sfnt_off0000af58.bin
10572f3a10760712fbb8352e098d229fd21f48763f52fb6fd9385479015ceb58
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF58 16060 bytes