Malicious PDF — malware analysis report

Static analysis result for SHA-256 7561d118b4a6a49b…

MALICIOUS

PDF

41.3 KB Created: 2020-08-21 10:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc33b10e365945091f446ef9d607b1f9 SHA-1: 08c6d044160acbf501d9f03d1bbbc9eb3e836c5e SHA-256: 7561d118b4a6a49b8bb77fd84c422b1993c8753021b1cef2a22fb9fc2edc6961
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting an SEO link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=jungbunzlauer+citric+acid+safety+data+sheet'. The document body, though partially corrupted, also contains this URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=jungbunzlauer+citric+acid+safety+data+sheet
    • http://files.tandemmom.com/uploads/1/3/0/7/130776518/6255870.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/auditoria_de_gestion_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/12th_class_chemistry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/benag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jidaxuno.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5280/files/jedutoderutowezawazusa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/nitefijejapavuwexorudonug.pdf
    • https://cdn.shopify.com/s/files/1/0437/7709/7886/files/belusojuragujer.pdf
    • https://cdn.shopify.com/s/files/1/0431/4962/3462/files/jigid.pdf
    • https://cdn.shopify.com/s/files/1/0435/5214/5560/files/kumuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/46249423699.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4307/files/ahmedabad_city_information.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006166.bin
5629dbf2a3cd18da1d7bf140329e0c73a3b0147951e7bc73246039b0be355461
pdf-font-stream PDF embedded font (sfnt) at offset 0x6166 5564 bytes
font_01_sfnt_off00007450.bin
26a75946210d3907575955db495964c63d4ccbc4ff29c469dc2e8d147844cdd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7450 10660 bytes