Malicious PDF — malware analysis report

Static analysis result for SHA-256 d690136fed6d6012…

MALICIOUS

PDF

62.4 KB Created: 2020-08-29 15:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29d052ddf0fd9cd42a034b2053147a42 SHA-1: 11c1ef4e55947afbcbd138f77b0018aa75cf39c1 SHA-256: d690136fed6d6012a62001d049b7b7ccc6948c79333fc97f1ed0ce50cae92020
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is also present in the document body. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be directing users to a malicious site via the embedded link.

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/wix?keyword=mass+cane+plant+care+instructions
    • https://static.usrfiles.com/ugd/b8c837_378f41b42f414a37bd4cc1379b8527a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_086d752e20924578be7c702e81248317.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8873021ca7949f9a9aab3c01abd3296.pdf
    • https://static.usrfiles.com/ugd/b8c837_56d54847a64f4655a2ec39c63baa34b4.pdf
    • https://static.usrfiles.com/ugd/9219f8_c0808fe4f4b44d3080a4caf3a256f923.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc094715d9b24a4fb7148df98740b45c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dc5fa4aef0642abb8432000f11f9378.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4ef5ad615cc40d399cde0dc95359476.pdf
    • https://static.usrfiles.com/ugd/08fe48_7205337752514e00b7476095b6323b50.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/dukononojifusid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/chaitanya_charitamrita_bengali_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/adventure_quest_warrior_guide.pdf
    • https://cdn.shopify.com/s/files/1/0463/3391/9387/files/translation_et_rotation_4me_exercices_corrigs.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_off0000b7c5.bin
d89544b1c7c6d7a9abab72020d3070d88194493b236dc0a24c6898ba57acb330
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 4932 bytes
font_01_sfnt_off0000c895.bin
4df4479c4cd44af21b0e04a7b161be92323ec091ca5750b2e91d05a2cf1d8d9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 10928 bytes