Malicious PDF — malware analysis report

Static analysis result for SHA-256 661555cc7720f889…

MALICIOUS

PDF

37.8 KB Created: 2020-08-29 20:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19eeb98e786e29b4aec85a8fe97dc3e4 SHA-1: 73b31e53d2a2641625816249314c8c05bca105e1 SHA-256: 661555cc7720f8890c33f733802a420d29c4f7e83d2ce5efc86588937e8ed2e1
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, likely as part of a phishing or scam campaign. The document body, though heavily obfuscated, contains the same malicious URL and references a 'free download' lure, suggesting a social engineering tactic. The presence of numerous benign Shopify links is likely an attempt to blend in with legitimate content.

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.cc/wix?keyword=3ds+max+vray+water+material+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8457/7956/files/99969838141.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/12088304632.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6558/files/99808006972.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/piwovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1402/0505/files/turbine_velocity_triangle.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/mivofoxizowedukipuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/87477811761.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/bamboo_bed_sheets_canada.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/redejudijux.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/57898335583.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2975/files/48358379067.pdf
    • https://static.usrfiles.com/ugd/ec0c41_b95431238a914f56a1de2e1ee0d0a13b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4820d587703c45f1bae3d88223922d31.pdf
    • https://static.usrfiles.com/ugd/4b68be_d7311ecbe6b547b6a6ea4f9548b8299c.pdf
    • https://static.usrfiles.com/ugd/b8c837_311c22bcd3a346988ed7ac3f2868541d.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_off00005553.bin
7616ae049cc7955eeabddacdee35d487f1f558821c86e0571f4b87bdb3ca6543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5553 5444 bytes
font_01_sfnt_off000067d5.bin
168eb2e9b45d8268b43b164a3d4535bed28df26776d4a62fc07d6a598ab2856d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D5 10052 bytes

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