Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9d0ae365e15e1e…

MALICIOUS

PDF

39.1 KB Created: 2020-08-23 19:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f57905949aae8ece8db41eaa1f4e9133 SHA-1: d303eae0b9c1a0d60cf57a59e040f0e48ca59b89 SHA-256: 7b9d0ae365e15e1e92ebe4bfad61c0ac8591139ec90e5b896f0f7e3dfdf15e66
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search engine results, leading to a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=adobe+xd+for+windows+8.+1, which is likely used to distribute further malware. The document body, though heavily obfuscated, contains references to software downloads, reinforcing the lure.

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=adobe+xd+for+windows+8.+1
    • http://files.foundationrepairdc.com/uploads/1/3/0/9/130969148/kusenekozitad.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9221/files/56959974508.pdf
    • https://cdn.shopify.com/s/files/1/0434/8323/4470/files/timubugapabojiwafasom.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6760/files/2020_census_race_form.pdf
    • https://cdn.shopify.com/s/files/1/0457/7918/9916/files/dyna_blaster_bomberman_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/9358/1212/files/zubukaxipedopafes.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/wabituroxaruros.pdf
    • https://cdn.shopify.com/s/files/1/0449/5199/4536/files/antitussive_and_expectorant.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/26674690794.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/67686760974.pdf
    • https://cdn.shopify.com/s/files/1/0428/9855/5043/files/puxufoxufosusewoxumosi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/business_english_pearson_2020_download.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_off00005c10.bin
a3e0485f8ebaf07e040eb23becdcc1dd102ee26882dfd59ffe856c5e7b670a41
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C10 5228 bytes
font_01_sfnt_off00006e0a.bin
f49d6b846309a897b61ffb8f3084fed4e43665086a03351086f8dfce859fd4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0A 9980 bytes