Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2bc41aa6af1a99…

MALICIOUS

PDF

43.7 KB Created: 2020-08-14 13:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dc4d19fa057e7318251e9581d7f9b66 SHA-1: 5b634e90fb290c81633bc6aef496579311b028b1 SHA-256: 5a2bc41aa6af1a9913901079fb8e29d94ff99112d74d384c8df5f05c35efa4e6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for technical information, likely to trick users into visiting malicious sites. The presence of multiple PDF links and a malicious redirector suggests a link farm or SEO poisoning attack.

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.com/pify?keyword=2014+chevy+equinox+manual+shift+not+working
    • http://xiwovu.sccwestcovina.net/uploads/1/3/2/7/132710780/0f2d197.pdf
    • http://files.carolynbjohnsonphotography.com/uploads/1/3/1/4/131453543/loxutito.pdf
    • http://gilew.athenscountystorage.com/uploads/1/3/1/8/131871597/vodidirurilazudopig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/97458464768.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/76095891359.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/ondas_armonicas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/12028418798.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/sepotunejazav.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/27464051382.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/28992345458.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/97682671571.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/holt_african_american_literature.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kazapuv.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_off0000691f.bin
f9b396f0c92c1f0eb002386461ee656ff9f348fd8add363ed2f841e0e40697f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x691F 6128 bytes
font_01_sfnt_off00007dee.bin
2dbb96446ff1fd9d8e45ac1e5aad84adb75ad47e33bf700552fd7b60a60100c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEE 10556 bytes