Malicious PDF — malware analysis report

Static analysis result for SHA-256 716b13ae17f694ee…

MALICIOUS

PDF

38.5 KB Created: 2020-08-30 21:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c09bdc81974752112a65db40e3af0b90 SHA-1: 52974ea95a3ff414909d8faca2a5f3df95e4b573 SHA-256: 716b13ae17f694ee8c433b688d1431d12983d1254f317d724a6c9b48af3b39c1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, https://ttraff.ru/wix?keyword=psicofarmacologia+para+psicologos+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL, suggesting the primary intent is to redirect users to malicious infrastructure. No scripts were extracted from this sample.

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/wix?keyword=psicofarmacologia+para+psicologos+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8231/7978/files/lugokebutabijelizosepezev.pdf
    • https://cdn.shopify.com/s/files/1/0459/7140/7015/files/32245416580.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/49887463057.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/riteruxovamikulaguwenu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/zefogaxujaxumiwadutan.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3816/files/autonics_tc3yt_temperature_controller_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/3000/files/homelite_leaf_blower.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3117/files/30060328318.pdf
    • https://static.usrfiles.com/ugd/a382ee_c0a9568fa70946fca7f133d765a82def.pdf
    • https://static.usrfiles.com/ugd/b8c837_c45b466862d24e3e9a3067ae7ffe2457.pdf
    • https://static.usrfiles.com/ugd/b8c837_93da3cb89b6c4814bb77bcdea6145e8d.pdf
    • https://static.usrfiles.com/ugd/e1d12c_fa4022bd2f15490db66fed3f286dbdba.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_off00005976.bin
f4eb3b0c6847e3bbb1e26ff4d2a92008033081466a33c93fba36fcdc8dcdcf48
pdf-font-stream PDF embedded font (sfnt) at offset 0x5976 5476 bytes
font_01_sfnt_off00006bf4.bin
db4ebaff5ce1eab07d2ca08f985c5e33911861553f714e59865393f0bec632ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF4 9848 bytes