Malicious PDF — malware analysis report

Static analysis result for SHA-256 40eba8fcae5535f0…

MALICIOUS

PDF

45.1 KB Created: 2020-08-14 21:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d805198f152c0e6c3a5f1af84fbb2bd3 SHA-1: 0ec0c0f595099fb9eebd489158c3f0551c7e88ae SHA-256: 40eba8fcae5535f0e6dbc3806a4cbe89d14d0038bc0759cd5aefed102140ea42
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, and the PDF structure reveals a large number of embedded links, many of which are likely part of a link farm designed to obscure the final malicious destination.

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=lockpicking+skill+up+guide+wow
    • http://files.eternal-acupuncture.com/uploads/1/3/2/3/132302872/tunupas.pdf
    • http://files.photosnapper.org/uploads/1/3/1/0/131069860/kilumaburuzu.pdf
    • http://files.mrsmoorehubbardsclassroom.com/uploads/1/3/1/8/131871852/7758164.pdf
    • http://xowimeru.mandala-ou.com/uploads/1/3/0/8/130874276/sidon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4230/7239/files/mudiralijas.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/pigixopuwofugafosebat.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/2015_ap_statistics_free_response.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/ansible_playbook_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/6871/1321/files/albany_county_deed.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/95233010982.pdf
    • https://cdn.shopify.com/s/files/1/0429/0795/9452/files/wokew.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9133/files/couchsurfing_android_app.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/rokerumep.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/catalogue_samsung.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/dental_caries_book.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/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007379.bin
1d4f1c29304b7194d2835f06ac56c3d4a6c43835e24f843481484c93dba03cbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7379 5032 bytes
font_01_sfnt_off000084be.bin
ca047eeaafd4bc6f00f4a2671b4a8ce4d8614467e76b942f26921a9239054f0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x84BE 10152 bytes