Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59ecac89115bdb2…

MALICIOUS

PDF

41.1 KB Created: 2020-08-21 02:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20036d8292bd610496689a6f8658bd4e SHA-1: 81bd1ed175c91a60ba7dfdaf347149498e90a897 SHA-256: b59ecac89115bdb2d494d60a3d1032f2513ba70ca74dcd19011929186296520f
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.cc', are likely part of a phishing or malware distribution scheme. No scripts were extracted, but the sheer volume of links suggests a broad-based lure.

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/pify?keyword=chennai+gana+songs+love
    • http://files.london-corbinairport.com/uploads/1/3/0/7/130774993/5a0d668.pdf
    • http://files.steveguycounselling.co.uk/uploads/1/3/0/7/130739916/puzexeje.pdf
    • http://nusipegam.boyscout507.org/uploads/1/3/1/3/131398097/d02f0559.pdf
    • http://files.heffernansheating.com.au/uploads/1/3/0/8/130814960/tasubevofajum-medut.pdf
    • http://files.skidmorecounseling.com/uploads/1/3/0/7/130739831/kerokoxezowotusodesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/80830591377.pdf
    • https://cdn.shopify.com/s/files/1/0436/2544/7587/files/stick_stunt_biker2.pdf
    • https://cdn.shopify.com/s/files/1/0435/5021/2264/files/winchester_reloading_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/wefuxitugalejekepeduzut.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4982/files/pose_reference_pack.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/18927445941.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/arduino_format_number_into_string.pdf
    • https://cdn.shopify.com/s/files/1/0437/6546/5249/files/76649614040.pdf
    • https://cdn.shopify.com/s/files/1/0431/5729/1169/files/aptitude_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1914/9216/files/48245851852.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5067/files/somaromafe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/61620040570.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d63.bin
749b5a5b52fb2f458c4dafe42d0016fa118aa6ea0282c33f2a0112eca2e22a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D63 4816 bytes
font_01_sfnt_off00005dc8.bin
d43ea7eada7130cb888e6587468edfd65774c4e0776956eeef59cebb0f968caf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC8 8436 bytes
font_02_sfnt_off00007497.bin
489c880e1639035439001f057622ab5fbe14af5e8d138086273088dbfafe5821		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 10252 bytes

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