Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adaa77398df93d5…

MALICIOUS

PDF

50.1 KB Created: 2020-08-07 05:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d432933963d91db3f03dba11a8b4090a SHA-1: 6f2f3f7ad44fc75e207b1468718deb1dbfb5d44b SHA-256: 4adaa77398df93d573e23c83e970ec6912ef5defa60b106d8e55f685f5712162
152 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 a redirector service known to host malicious content. While some links point to benign Shopify-hosted PDFs, the presence of the malicious redirector indicates a likely attempt to lure users to harmful sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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.ru/pify?keyword=anemia+ferropenica+que+es+pdf
    • http://files.stlcreativelandscapes.com/uploads/1/3/1/8/131856186/faxogipenap-pujezowir-bawenuvo-bunokavinabe.pdf
    • http://files.fureverfashionbyaprilllc.com/uploads/1/3/0/8/130814118/5600020.pdf
    • http://files.sidebysideuk.net/uploads/1/3/1/3/131379111/7c1a880230d4d11.pdf
    • http://files.fhsvocalmusic.com/uploads/1/3/1/1/131163777/8332410.pdf
    • http://files.midnightexpresstradingco.com/uploads/1/3/0/7/130775730/3cedad5f873ca3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/ifelse_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0436/1024/3230/files/balancing_chemical_equations_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/learn_to_speak_english_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/45818413267.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/letter_of_appointment_of_executor.pdf
    • https://cdn.shopify.com/s/files/1/0433/7254/4150/files/74720058587.pdf
    • https://cdn.shopify.com/s/files/1/0436/1116/0739/files/mixefawigudifeguxowuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/3290/2823/files/husqvarna_223l_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/1889/2958/files/20266855131.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24501063531.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8828/files/gesinaluditipug.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/gisejijese.pdf
    • https://cdn.shopify.com/s/files/1/0439/4775/3640/files/tuzegefifufixolatiwegob.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/nemapurisuxi.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/
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/nema

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008606.bin
f70e2bc17a90c1538e3437cfd7690ed1612cc52e2cbeab803b6aa5db6066ccb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8606 5384 bytes
font_01_sfnt_off0000983a.bin
ffc6152889d52be3f1ff82bbc2a56cf3188b42fb55485a7ea04e88c07dfdaf6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x983A 10424 bytes

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