Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74b04650122c95c…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 14:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f35365baff3bed1965d05947e75dcf2 SHA-1: f9c29dc7f5eb2e708b779c15040dfbdee5ec2e6c SHA-256: a74b04650122c95c30a2818c60d55b43a8cd432c5dcb78885df8a576878745c0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is flagged as malicious. The document body and embedded links suggest a lure to trick users into visiting these sites, likely for further malicious activity. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=asuran+movie+online+free
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/castillos_de_cartn_almudena_grandes.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8711/files/mugelagudofegoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4275/0114/files/32722961343.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/58912540220.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/lefuvuxobatufa.pdf
    • https://cdn.shopify.com/s/files/1/0445/7014/9023/files/11854130836.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3563/files/48795317041.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/refenexivexoralef.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/vawulibevolatumifexan.pdf
    • https://static.usrfiles.com/ugd/b8c837_916e44f6fad5480fa1539ac33117e80c.pdf
    • https://static.usrfiles.com/ugd/c7a620_ca9267f8b16a4ecfb39eb195e48c45a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a586055689a44ff191ed48523f317cce.pdf
    • https://static.usrfiles.com/ugd/78c764_43239404f7584f7592d455cb8fa0f1d4.pdf
    • https://static.usrfiles.com/ugd/930050_dbd46871163446cb95ed7db02f3e94d8.pdf
    • https://static.usrfiles.com/ugd/0a0016_c8b3b5b1ba7a4dcab64381691fb7c867.pdf
    • https://static.usrfiles.com/ugd/0dd040_bf3e91cf0504448a9bcdf443ec6eea2b.pdf
    • https://static.usrfiles.com/ugd/9b33c5_43b707b01d234842a5bc4861bd808d9c.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063a2.bin
213c25f7fed47bb2e4a447a4261f1fccba321baa58ac6b579a2c4da81f7c1552
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A2 4960 bytes
font_01_sfnt_off00007471.bin
ea3aa03c85cebf7f617e59a204c6ca793caefe50915d3faad30773eeb85c14d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7471 10428 bytes