Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cd6100c62f7045…

MALICIOUS

PDF

34.1 KB Created: 2020-08-30 23:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b05f14cd64c5c47d5170fba363fbb27 SHA-1: f5da3155da052fbab2b2fd70b7c3d4cb8ba32099 SHA-256: 64cd6100c62f7045892023ea07ddd472761dab42fa00fb9c7499f332e33f4ee2
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, includes text that appears to be a lure related to an audiobook title, combined with metadata indicating it was generated by wkhtmltopdf. The presence of a malicious redirector strongly suggests an intent to lead the user to a harmful site, likely for phishing or to download further malware.

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.ru/wix?keyword=the+thorn+of+emberlain+audiobook
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/51291704370.pdf
    • https://cdn.shopify.com/s/files/1/0439/2206/3515/files/jokozanijiwiduzupet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/d_d_5e_online_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0462/2018/1658/files/terraria_destroyer_expert_guide.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/accuweather_van_meter_ia.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/14471589738.pdf
    • https://cdn.shopify.com/s/files/1/0440/6358/8502/files/lafatodanuvapotudonug.pdf
    • https://static.usrfiles.com/ugd/b4609a_2c4938c4ffc949dbbe1784105fdc27a2.pdf
    • https://static.usrfiles.com/ugd/fb83f1_eac34f6eb3ce411591da5b1840d043a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7ef624ea4c24ec9b07957656968102d.pdf
    • https://static.usrfiles.com/ugd/97368a_01d5d0d62fbd4723855c3fd1ddaba36e.pdf
    • https://static.usrfiles.com/ugd/5b604d_47687b8f3b7841969e9b538fed553993.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5377/files/pantara_dirt_bike.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/tosesozumalomatamomuposet.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/income_tax_assessment_year_2020_20_form.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_off00004894.bin
4dfcdda0d059c89d6c719e52795065b38ef11e5f52f8dbb092197d28a5979941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4894 5120 bytes
font_01_sfnt_off000059cc.bin
dd1a66cac3dafcf7026abe712134f5fd807afc0f7bae69f031ce51ff8384c2ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59CC 10200 bytes

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