Malicious PDF — malware analysis report

Static analysis result for SHA-256 86077100ae43ea6f…

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 08:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3086209a09a1475e3847e2311da40434 SHA-1: 3127c75f1bf295fedafe5d6fd846bad8a50e95d4 SHA-256: 86077100ae43ea6f3ed032750faf3cc5f0aaf03605ef180840862060637ce738
162 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=pdf+file+format+name
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/5e_money_conversion.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/1749432591.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/rixugurine.pdf
    • https://cdn.shopify.com/s/files/1/0461/7538/7811/files/alight_motion_app_apk.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c3b0493223c4ed5a6f67cb6936cf2a5.pdf
    • https://static.usrfiles.com/ugd/71fd01_9a4b6ba87fd34a5a873f090a9d2d9e2d.pdf
    • https://static.usrfiles.com/ugd/eed56f_7ee1821a1cf04501ac1363f142536f56.pdf
    • https://static.usrfiles.com/ugd/b8c837_a496ec9dafba4540af55f577d62db32e.pdf
    • https://static.usrfiles.com/ugd/b8c837_685f752c2e35491fab12d5c193624096.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/kazawuwogafalumet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0407/5933/files/wiwob.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/32485333267.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2070/files/atv_winch_cable_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.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_off0000686e.bin
0bd605a2aa46906a0205850671bcc430894ce2d222233481554e175508362b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686E 4876 bytes
font_01_sfnt_off000078e6.bin
8c384fe0d4a9c4cb6f5cd2278d3faeb95177238c68df5e84203065c1be26342b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E6 10412 bytes

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