Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba87db86b5ad176…

MALICIOUS

PDF

42.6 KB Created: 2020-08-28 01:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 301cd07095625ce98ef3ed6ab4ff68b5 SHA-1: c4d5c102f22456e0ba733b895d645cd0976d4a4c SHA-256: aba87db86b5ad176c34d7ad35f888ddbacc7d089c75652936f795b07984e6809
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The document body contains text that appears to be metadata and obfuscated content, but the primary malicious activity is driven by the numerous links, one of which is a known malicious redirector. The presence of many links to external PDFs suggests an attempt to manipulate search engine results or to host malicious content.

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=2009+gary+fisher+piranha
    • http://files.samwattfitness.com/uploads/1/3/0/9/130968963/misemajetatimeb.pdf
    • http://dupunu.cassandras-corner.com/uploads/1/3/0/7/130738993/49fbd1f.pdf
    • http://luwujobi.fsk-midpen.com/uploads/1/3/1/1/131164250/jotesaxaso-retazobaj.pdf
    • http://files.designer-parties.com/uploads/1/3/1/8/131857270/lanakudesukog.pdf
    • http://sotuvavu.tinmanministries.com/uploads/1/3/1/3/131383791/6658085.pdf
    • https://cdn.shopify.com/s/files/1/0433/6762/8950/files/five_senses_worksheets_for_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/34280464016.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/kerapeninixup.pdf
    • https://cdn.shopify.com/s/files/1/0441/2126/0184/files/xumesotukerakafibitosabi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0325/4683/files/char-_broil_performance_seriestm_220b.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/mufonoroz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1823/0688/files/54514072938.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/liberal_aim_of_education.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/jinofufanokisutovixejizuz.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/jolivelubesosupuxu.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_off000062ab.bin
13c26077cd730b401eca0798f15cfa0994afd4c9241c966b158f15577677134d
pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 5568 bytes
font_01_sfnt_off00007594.bin
a6cc8781371e33b93404a1a24a63ffce656ec977b2ac789cd8b336c3c737eca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7594 12496 bytes