Malicious PDF — malware analysis report

Static analysis result for SHA-256 a673a5f18fc54e06…

MALICIOUS

PDF

53.7 KB Created: 2020-09-06 18:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2cddc8c2b52ccfa097d126de73b7fc1 SHA-1: 0f536e35654c93d1ef59de69ef761a75114673a1 SHA-256: a673a5f18fc54e0641dc689249481ae0b0446bec6e653f12dd4371a651edd2a7
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.club/wix?keyword=pz26+carburetor+tuning+guide, is presented as a carburetor tuning guide, indicating a social engineering lure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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.club/wix?keyword=pz26+carburetor+tuning+guide
    • https://static.usrfiles.com/ugd/83e24f_6edf6015cab4415f935945b2916320f5.pdf
    • https://static.usrfiles.com/ugd/a8cc01_08a0d9aef2e8495483fa701d8bdedcf8.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_f7beed8fa9634a489e1a276801549de5.pdf
    • https://static.usrfiles.com/ugd/b8c837_8479371d19b44e2cbf5b22b5ffaed65b.pdf
    • https://static.usrfiles.com/ugd/4bb894_ee9006a66e92419ebb3654c70f264662.pdf
    • https://static.usrfiles.com/ugd/dbbfd0_3528f2ea43b44aeaa095312feb276ad2.pdf
    • https://static.usrfiles.com/ugd/b8c837_3905be4b457444fa9f0e98a4d2f747d2.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_ebfadaa4d91842089bebc43350cdc405.pdf
    • https://static.usrfiles.com/ugd/4c1554_bf065c4ea2c0441b9dd369489c8e2d5a.pdf
    • https://static.usrfiles.com/ugd/1decf9_af42489f1eae45d78d7c2b492738014e.pdf
    • https://static.usrfiles.com/ugd/f34323_d2edf4adf4b240ddb8e8fa6df8d62b0d.pdf
    • https://static.usrfiles.com/ugd/2274a7_9e986a8f22074aa18a08bd91cfa00ca7.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5646/files/cancellare_conversazioni_whatsapp_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/2772/6489/files/xafokemodexibup.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/amharic_fiction_audio_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0463/0672/1957/files/12434089885.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/pukotiril.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_off00009374.bin
686c0bb71a6bf617fcdaa9a0b56a643e22cb132757cdc128706cd679f0d3a38e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9374 5372 bytes
font_01_sfnt_off0000a5d1.bin
6493b859e8553c170e128dc686ed6b87e11aa428e8a27161c9afc420a466522f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D1 10768 bytes