Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcd9b50df61a335…

MALICIOUS

PDF

35.2 KB Created: 2020-08-17 12:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3f774edb7095c4657d2f49664186d91 SHA-1: 077bd111e478dd76a54c0ca13ec4e62e2292540b SHA-256: 9dcd9b50df61a3353d50c1e7abf3deab94bf2738c37e61e53e3056a651685132
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a malicious redirector, with a critical heuristic firing for numerous external links, including one pointing to `ttraff.com`. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the sheer volume of links and the redirector heuristic point to a delivery mechanism for further malicious activity.

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/pify?keyword=longreach+regional+council+road+report
    • http://lisaf.reyerfarms.com/uploads/1/3/0/8/130874376/dazixidugobax-vigubapadovexo-digonutitevuxis-somovela.pdf
    • http://files.elmwoodpubliclibrary.org/uploads/1/3/0/7/130775557/1162030.pdf
    • http://lasimiji.serdirection.com/uploads/1/3/1/6/131637562/5396529.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/73857607367.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/97988124549.pdf
    • https://cdn.shopify.com/s/files/1/0431/9232/0161/files/agenda_2019_maroc.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/kexivetetivasemem.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/rawamolesibapa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6472/8479/files/medea_euripides_gredos.pdf
    • https://cdn.shopify.com/s/files/1/0447/4788/2650/files/simple_man_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/orwell_burmese_days.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/kotororokekifov.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/agriculture_robots.pdf
    • https://cdn.shopify.com/s/files/1/0431/1652/7770/files/77569381217.pdf
    • https://cdn.shopify.com/s/files/1/0430/2569/4883/files/contoh_dokumen_amdal_pabrik.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/initial_psychiatric_evaluation_template.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_off00004de3.bin
dd43930e5241454c6aaf0b8c9d850d997fc9e47fc0d6b7c9c035b4302ded7ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE3 5100 bytes
font_01_sfnt_off00005f2d.bin
e237d701510d525d95bd1666f785a8b9f4e23faef38283335658f3b580a0ad49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2D 9620 bytes

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