Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1011b307332928d…

MALICIOUS

PDF

51.2 KB Created: 2020-09-01 05:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6682fabfd909647c6838e9f3421fc4 SHA-1: 5c26e400bc3fcdd4cf6892181605f738b226dabe SHA-256: b1011b307332928d8a551e66a119393f9292b3b097a0175c848c5ef403cf1000
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a free bookkeeping spreadsheet, which is a common lure for phishing or malware delivery. The link points to a known malicious redirector, ttraff.com, which likely serves further malicious content. The PDF also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=free+bookkeeping+spreadsheet+for+small+business+uk
    • https://cdn.shopify.com/s/files/1/0434/7704/1304/files/wekagesuzizitokexo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/rixopipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/ohio_guidestone_lorain.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/89729896176.pdf
    • https://static.usrfiles.com/ugd/8de238_0277f8ae94cc4d11a77662030bebb12d.pdf
    • https://static.usrfiles.com/ugd/2074c9_a892cef2563446bdac4fd839743e14dd.pdf
    • https://static.usrfiles.com/ugd/a01749_c5963e2bbaf548c297c82ff64903c46d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a246bd3c8db64697a47402bef4858f06.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/chemistry_of_materials.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/53730037369.pdf
    • https://cdn.shopify.com/s/files/1/0435/7819/6129/files/75467748111.pdf
    • https://cdn.shopify.com/s/files/1/0438/9814/2875/files/the_minto_pyramid_principle_logic_in_writing.pdf
    • https://static.usrfiles.com/ugd/a18aa6_e61457e9aa134d8486c8a74ea45cbab5.pdf
    • https://static.usrfiles.com/ugd/e2f197_4509b6351e0b44d6aa3bc4e20cd4c5b6.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_off0000891e.bin
6c8172bea01e0d05835a38b13547f4351974d37927cca18ada958c18f692412a
pdf-font-stream PDF embedded font (sfnt) at offset 0x891E 5616 bytes
font_01_sfnt_off00009c11.bin
ac840b22555232f8a344629fb2c8ddbce5859b9f868e58f040acccd6332b1c2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C11 10384 bytes