Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c5b75d5ca9aad8…

MALICIOUS

PDF

40.0 KB Created: 2020-08-05 16:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d36cdc419090b4dda1e16b9ae2a205a0 SHA-1: c7c91d720e70107332dbae367fc3404a719518a6 SHA-256: 75c5b75d5ca9aad837defc5c79ac8cafafe22d3b549a2ad1af5ddf6031944101
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to direct users to external content, potentially for phishing or malware distribution.

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=auditoria+de+tecnologias+y+sistemas+de+informacion+mario+piattini+pdf
    • http://files.nyccbtp.com/uploads/1/3/1/6/131637218/peligus.pdf
    • http://files.digitalxraypros.com/uploads/1/3/0/7/130739578/c6937752684b210.pdf
    • http://files.scibridge.org/uploads/1/3/1/3/131383483/6556629.pdf
    • http://files.racechase.org/uploads/1/3/1/3/131381428/a590d342.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/8111/2483/files/49833045434.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/veliverexetududoxovogelo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/xituwumexulapufunalux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/14379729578.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/75701063030.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/84053718748.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/parasitologia_humana_david_pereira_neves.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/17415268082.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/93029395134.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9506/files/yg_mp3_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5716/files/56975857205.pdf
    • https://cdn.shopify.com/s/files/1/0429/2208/2460/files/87670902855.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cc3.bin
ac110cbb8a88c4ea5c130ea8a393128eac1df1110df68ecd6504c7d8b6d9a177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC3 5448 bytes
font_01_sfnt_off00005f39.bin
5dde86afaa83b9ee45a5aaa70eacca03baafdfdfef1d89a33f4d114ff79f6095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F39 10544 bytes
font_02_sfnt_off000081d4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D4 4324 bytes

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