Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88bf9784977c8b0…

MALICIOUS

PDF

44.6 KB Created: 2020-09-02 03:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4451b47f2f667ebe7717ce9c0407da6 SHA-1: afd2f156bf1c0ee8afadb1c5d00d91cae0816557 SHA-256: b88bf9784977c8b09ebba0e17994807d1c9ac3acb392febfdfdbcae4e94a0e75
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF documents, a technique often used for SEO poisoning or to obscure malicious activity. One of the embedded URLs, 'https://ttraff.com/wix?keyword=analise+pest+e+swot+pdf', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious infrastructure.

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/wix?keyword=analise+pest+e+swot+pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/gapezuvijupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3092/0871/files/pm_awas_yojana_offline_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/araldite_2014-_1_technical_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2559/6573/files/blender_dope_sheet_empty.pdf
    • https://cdn.shopify.com/s/files/1/0436/5628/2265/files/pisixizuwedexiwerazalew.pdf
    • https://static.usrfiles.com/ugd/3f8d85_dd10d8544aaa4af58fa8270e9a2e9853.pdf
    • https://static.usrfiles.com/ugd/756799_295c200fcf8f4b15a31ae152431ac052.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/94405068102.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/james_stewart_calculus_early_transcendentals.pdf
    • https://static.usrfiles.com/ugd/d99ef3_2fd1c8e883274405bc85bc34c710989c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e89944775ce4cac9cbbc9645d74763d.pdf
    • https://static.usrfiles.com/ugd/49f5ef_5e1033a001454fa1951f048789a0e640.pdf
    • https://static.usrfiles.com/ugd/b8c837_e39f5220c022485ba0e63cdb5461b43d.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_off00006448.bin
7d067f38c3575990ca8fad8fd6249a71d13b76732b8f4314e5fab3a1cee25ed6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6448 4808 bytes
font_01_sfnt_off000074bf.bin
24b97ca0f74f0ff0e8e72d56889bc84be83f18978a295a27e1aea04c067f822e
pdf-font-stream PDF embedded font (sfnt) at offset 0x74BF 10160 bytes
font_02_sfnt_off00009739.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9739 4324 bytes