Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f9008d54b9aa2d…

MALICIOUS

PDF

42.1 KB Created: 2020-09-17 01:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a55759174c03e61279de2bc4466e96 SHA-1: 514426aa3f190a4809b61ffb11b283f3561b95ec SHA-256: 31f9008d54b9aa2d693c07f19b247f00484324f0d5c424ca6a5a9d885e075469
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=declaring+independence+worksheet'. This URL is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier also 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.club/wix?keyword=declaring+independence+worksheet
    • https://14dd6101-3ef5-4f62-80ca-52ddf4ef171c.filesusr.com/ugd/92ee2b_5c3c0a8b8ec24a9f9805372ac13e2a3f.pdf?index=true
    • https://5ed8081f-75af-487f-b0c1-f92cb28a906f.filesusr.com/ugd/9734e7_1f58b4ac03f344b58bd51fd357df03cf.pdf?index=true
    • https://35276998-5be1-4f8a-a056-6d47238194ec.filesusr.com/ugd/d13e1f_77b86d2cb12d418e9dcea73825ffd18e.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68736518606.pdf
    • https://cdn.shopify.com/s/files/1/0432/3183/8368/files/fire_red_cheat_codes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/81926693167.pdf
    • https://cdn.shopify.com/s/files/1/0464/7596/8662/files/jifib.pdf
    • https://cdn.shopify.com/s/files/1/0432/5828/2152/files/tour_of_go.pdf
    • https://cdn.shopify.com/s/files/1/0430/1897/7443/files/amt_fr_informationstechnik_und_digitalisierung.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7238/files/51321164965.pdf
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/ritekapezate.pdf
    • https://cdn.shopify.com/s/files/1/0437/7840/8609/files/types_of_leadership_styles_in_management.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1701/files/baxagamezojuraxow.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_off000064c4.bin
3d054843912a2b67fe1cea24c62fa53d307b3fc9c3dc01be1d7c394c8f6ac153
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C4 5488 bytes
font_01_sfnt_off00007781.bin
a92e3846bca94f9583e9264c31f74232c5783e3b770696c92756a80b07747779
pdf-font-stream PDF embedded font (sfnt) at offset 0x7781 10652 bytes