Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a909728b6e1471e…

MALICIOUS

PDF

51.7 KB Created: 2020-08-20 12:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd1b171edb09c53d33b0b2988a9461f3 SHA-1: 232692695502ec575e03b0d147e7dd233b8be9e6 SHA-256: 3a909728b6e1471ed264f5216e8fac09bbdac80e350237f4c07b87203944d9ac
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the PDF is designed to lure users to malicious websites, likely for phishing or to download further malware.

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=dataannotations+c+datetime+format
    • http://pavixeki.stpeterscatholicschool.com/uploads/1/3/1/4/131483200/9914484.pdf
    • http://files.omsairaksha.com/uploads/1/3/0/7/130738848/wubopodes.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/79990832420.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/loniruriladuno.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/anatomy_and_physiology_lecture_notes_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0450/1933/2766/files/anatomy_bodybuilding_a_complete_visual_guide.pdf
    • https://cdn.shopify.com/s/files/1/0459/1924/0341/files/tawogewukunenopugif.pdf
    • https://cdn.shopify.com/s/files/1/0435/7118/3777/files/tagodafuwejixevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/nivujogatujitafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3434/files/verbo_sum_latino.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8419/files/management_organizational_behaviour_mullins.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0156/files/pdf_files_download_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/bobemolevasutovasubumese.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/1/0435/7118/3777

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000826e.bin
20a10db8a868767df5dc4798d48ca7515ddf15fb54bb33d1d1f670441b99dec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x826E 5132 bytes
font_01_sfnt_off000093c8.bin
f849b1488f4c7cc74a79a3fb8422a51057066483555bcf0a65d6e4339fd56e29
pdf-font-stream PDF embedded font (sfnt) at offset 0x93C8 14920 bytes