Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ebdfdc2209a488…

MALICIOUS

PDF

79.4 KB Created: 2020-09-08 14:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36dae6e9466a5d8f46744c091b82a78f SHA-1: e6356c8de58e06d285b05239c64fabcc1ff9b9c1 SHA-256: c3ebdfdc2209a488357f59766a7eafb277a61ee305bd7bedce2e32bc16392f97
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=e+maxx+3906+upgrade+guide', is designed to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, likely 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.cc/wix?keyword=e+maxx+3906+upgrade+guide
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/wajudede.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/12602787197.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/bsc4success_july_2020.pdf
    • https://static.usrfiles.com/ugd/8c2e83_1b07cc4b018c4842a00fecc0e7f4e357.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_3f5e03afb7f74bb4accf6ab7d53c769d.pdf
    • https://static.usrfiles.com/ugd/5ea4d5_c3feee5403144ebb829d1b79d25d42ad.pdf
    • https://static.usrfiles.com/ugd/e49726_b197d8ea716b4473b76e2a795571310d.pdf
    • https://static.usrfiles.com/ugd/87fdc7_0d4cc3800b2e4a92be65331b59bb74b7.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/kifiremosunegizesig.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/fuel_filter_cross_reference_chart.pdf
    • https://cdn.shopify.com/s/files/1/0466/4095/5557/files/pawatefijupidasefuxowop.pdf
    • https://static.usrfiles.com/ugd/111c46_ab572a3f7d4e4083afe0193fe456bf50.pdf
    • https://static.usrfiles.com/ugd/384ea4_ab881af6c0194f34be87e04d0e519e86.pdf
    • https://static.usrfiles.com/ugd/5af86b_a45780f0c7c145c79f5b9100adea9b9b.pdf
    • https://static.usrfiles.com/ugd/4329d7_73bd61c740254254b9523b40b7a196f5.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_off0000f93c.bin
f0d06f34cf2cd4f97a620bad0201deefce51a6567b4f742a84f31d4a14bc37c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 5708 bytes
font_01_sfnt_off00010c8b.bin
f64242e8b65bf5f28396afd18be4ad37efaa06349de2d455722251646e31a9a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 10560 bytes