Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce15da52e6aabb9f…

MALICIOUS

PDF

36.8 KB Created: 2020-08-19 17:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27122440a3c4ebe1e5540fa3ade96fb4 SHA-1: 127350edf1d23faf51bea81fe5121f82a02c530a SHA-256: ce15da52e6aabb9f132fc64fd42f7a444f8c1a26c9bd4d92441444bb377a079c
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a 'grad party invitation template'. This is further supported by heuristics indicating a malicious redirector link and a PDF link farm. The document body, though heavily obfuscated, contains the malicious URL and several other PDF links, likely part of a link farm to improve search engine ranking and distribute malicious content. The primary malicious URL is https://ttraff.com/pify?keyword=grad+party+invitation+template.

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=grad+party+invitation+template
    • http://zigetu.nyegirlboutique.com/uploads/1/3/0/7/130738799/kigufaxuwusesuta.pdf
    • http://xubuw.libertybiosecurity.com/uploads/1/3/1/4/131482952/bukosoz.pdf
    • http://mekebus.fillingthekleinbottle.com/uploads/1/3/1/3/131381612/mejawojemuzuwo.pdf
    • http://files.ashma.studio/uploads/1/3/1/3/131398236/dimifipobosasibas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5937/9357/files/xominovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/vengaboys_shalala_lala.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/medical_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/bhagavad_gita_chapter_1_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/35694482354.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/enduring_power_of_attorney_ni_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/gastropatia_por_aines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2908/5859/files/birthing_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/vasigemeviz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/movimiento_muralista_mexicano.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_off00004a0b.bin
84c01f943ed5a86a90cbc07ba4c27ae041de4468d6bd4306262d6d35e81be340
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A0B 5120 bytes
font_01_sfnt_off00005b79.bin
05a2ddffefcf54b7ad0ae7ad253907dd55491ac6c4a087a8ac2dc5926fa4b00c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B79 14120 bytes