Malicious PDF — malware analysis report

Static analysis result for SHA-256 685f42791c422bc6…

MALICIOUS

PDF

39.3 KB Created: 2020-09-02 09:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d50d26cb81154eee52b54ab7a396af1 SHA-1: a9c792c912b92e2a95bdc4d03de762dbb248cd25 SHA-256: 685f42791c422bc6025217d5b9c2e32740d6877a67a040da6c53df373b20a537
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a PDF link farm, with at least one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to malicious infrastructure, potentially for phishing or malware distribution.

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.me/wix?keyword=apple+store+.+com
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/804ff6_b1791ec6c6f54902822128f39e0ffc92.pdf
    • https://static.usrfiles.com/ugd/b8c837_c73cfb7d4e44477f809a204966db6af4.pdf
    • https://static.usrfiles.com/ugd/fafc38_446d50ee5fcc4e59a2b6082aab3265ca.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/92667993186.pdf
    • https://cdn.shopify.com/s/files/1/0463/4689/5517/files/bakaxoga.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/kefox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/fumulasijugoxipi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6174/files/gibujesisoziwowikogu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/vibilobafamaxunepefafixu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7807/1960/files/7726389664.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/no_network_access_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/zizufivev.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/23071746123.pdf
    • https://cdn.shopify.com/s/files/1/0433/7667/2918/files/camera_lenses_for_dummies.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_off00005dff.bin
561b731136cc8dedf6a150c00c479245434923e93e6cfd57472759f6888c654a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFF 4888 bytes
font_01_sfnt_off00006e8f.bin
6005703a741daccc449378afc80b5dbef5b7a40f9d219c49e2ad09b355eefc33
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8F 10060 bytes