Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c6002166a2c1e8…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 15:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a392846d1fcf61b3b906f48a443c3b0b SHA-1: a9d3df1dc96b26ff5a44516e58cb0f8a4303c5f9 SHA-256: 88c6002166a2c1e82423f48f848c52ed8c8d9e1183ab04ddbae7786fae50b895
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link to a known malicious redirector, which is a strong indicator of malicious intent. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, contains text suggesting it is an evaluation form, likely a lure to encourage clicks on the malicious link.

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/wix?keyword=sample+evaluation+form+for+interview
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_13c6e15a2bbb44e0960c249ea6c64255.pdf
    • https://static.usrfiles.com/ugd/b8c837_39031162c1a244c890e29b41318ea892.pdf
    • https://static.usrfiles.com/ugd/5be868_1fe79cadc520477d85fe90d7ed37c697.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4992/files/fusionner_pages.pdf
    • https://cdn.shopify.com/s/files/1/0435/1701/8267/files/vitinoxidirowova.pdf
    • https://cdn.shopify.com/s/files/1/0433/3151/8622/files/mejajonatime.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/comptia_network_certification_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7334/7488/files/barton_removable_mainsheet_track_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/81947092000.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/15032775270.pdf
    • https://cdn.shopify.com/s/files/1/0461/7948/3811/files/99892494802.pdf
    • https://static.usrfiles.com/ugd/d55797_034547f978c2468fbb1f862f4451cc99.pdf
    • https://static.usrfiles.com/ugd/45fd81_ade1dc5975994805bf9f60eb0d511964.pdf
    • https://static.usrfiles.com/ugd/a43ec6_52df8edbcb7c4a5580b8db50846b2c6f.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_off000073ef.bin
b4f032ae9181f6de75b9e49ff25696d1c054483453d8dc31690e1100def24936
pdf-font-stream PDF embedded font (sfnt) at offset 0x73EF 5124 bytes
font_01_sfnt_off0000855d.bin
d951da86ff8df02a65c39c0dda48e62582741ef251d242ba982db3dbbf877098
pdf-font-stream PDF embedded font (sfnt) at offset 0x855D 10252 bytes