Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfe91c706a33227…

MALICIOUS

PDF

51.0 KB Created: 2020-09-07 03:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5e8faaee54073bcc4bb00096ebf2c3 SHA-1: f09516d4eeff4b1f478e0cfa912fa633260fabc6 SHA-256: 3cfe91c706a33227c03c75fc13f667edb7ebe1b7fde0854897a3acc68a5fe933
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=current+liabilities+on+balance+sheet'. Additionally, it exhibits a PDF SEO link farm behavior, with numerous links hosted on cdn.shopify.com, one of which is 'https://cdn.shopify.com/s/files/1/0430/2585/8723/files/jirus.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, suggesting a phishing or malware delivery attempt.

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.link/wix?keyword=current+liabilities+on+balance+sheet
    • https://cdn.shopify.com/s/files/1/0430/2585/8723/files/jirus.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/bibukagidegara.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/android_apps_on_linux_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/8458/6903/files/49772427108.pdf
    • https://cdn.shopify.com/s/files/1/0437/8266/8437/files/51151519233.pdf
    • https://cdn.shopify.com/s/files/1/0432/6051/0376/files/kerala_blasters_fc_kit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/tulora.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/vabofuveporagepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/53235011546.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9969/files/linear_algebra_history.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5229/files/lobufero.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/39695303219.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/56005100.pdf
    • https://cdn.shopify.com/s/files/1/0433/3135/4774/files/also_sprach_zarathustra_score.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/hd_background_for_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9557/files/rubukuruvixoluta.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/78988957507.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c08.bin
59c7ffa027ec078556b90f5220f3c3d4ddddf3fb225ea92a7bf55d7909ceee41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C08 4932 bytes
font_01_sfnt_off00008cb9.bin
e5b4c49671f6a76470314b647245aa2eef8b3feb0cc41a126cd96459be63a26a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB9 10404 bytes
font_02_sfnt_off0000b04d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 4324 bytes

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