Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa642e419bf7f645…

MALICIOUS

PDF

40.9 KB Created: 2020-09-01 11:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5c29e7817851fcecbc5723c21349f0f SHA-1: 0b0a2f8c680ec5832dfdb53226dfc6ea8cfda9e5 SHA-256: aa642e419bf7f645f803e05426362d6da996319b7686d5303c63a08e0310ac1c
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, however, redirects to the malicious domain 'ttraff.com'. The ML classifier also flagged this PDF with high confidence. The presence of a link farm combined with a malicious redirector suggests an attempt to lure users to malicious content.

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=tema+whatsapp+aero+ios
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/contemporary_nutrition_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/99876459691.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/bilingual_dictionary_french_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/6369/7817/files/68843794720.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/98366310278.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_6bf7760c8ce0449e85b0a417618b0758.pdf
    • https://static.usrfiles.com/ugd/8dde66_15bb5b4c6a0b4f3da369d0d4ea2debbd.pdf
    • https://static.usrfiles.com/ugd/bf650e_d600182ef61342bd810a5df7b2a5685c.pdf
    • https://static.usrfiles.com/ugd/585b1d_d07df1399d974807a90b8918240c3f7f.pdf
    • https://static.usrfiles.com/ugd/26481d_dd94278cc5de483180c4ca5910c3849d.pdf
    • https://static.usrfiles.com/ugd/c83fdb_610ef861b3c44869841ab82200790916.pdf
    • https://static.usrfiles.com/ugd/41a0b6_3ba6eb0b42cb4e818cc718cafba676cb.pdf
    • https://cdn.shopify.com/s/files/1/0437/1903/2987/files/fema_is_144_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/pdf_notes_on_child_development_and_pedagogy.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/82831220357.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_off000061d1.bin
171c00e22b9f380958d2bdeeba9e5c659ac691412221299d2124af5ae202c712
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D1 5068 bytes
font_01_sfnt_off000072ef.bin
a56ce5608c9ae867de4ad4184a3d63c613f80e2ecae27ac2a3fd529d522fde05
pdf-font-stream PDF embedded font (sfnt) at offset 0x72EF 11060 bytes