Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3493e42fd0d707…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 12:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97e93313adbcb17747228f84e2b2b3b4 SHA-1: 41bc6ca67b4e4883a5040344eb6edbdf60757192 SHA-256: 4b3493e42fd0d707ea72ce0b559eace39378e91fc30935998f322b616be46df5
150 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 link farm hosted on cdn.shopify.com. One of these links, 'https://ttraff.cc/pify?keyword=thyroid+hormone+therapy+for+older+adults+with+subclinical+hypothyroidism+pdf', is identified as a malicious redirector. The document body text, though heavily obfuscated, appears to be related to medical information, likely a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=thyroid+hormone+therapy+for+older+adults+with+subclinical+hypothyroidism+pdf
    • http://files.veenalothelaw.com/uploads/1/3/1/4/131437044/3401932.pdf
    • http://files.dearborn411.com/uploads/1/3/2/7/132740860/xokagilo.pdf
    • http://files.applyready.com/uploads/1/3/0/7/130776499/bidizanilagu_gaxazujoze.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/dimamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/rorujumabuxatekotoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/bosovimelivul.pdf
    • https://cdn.shopify.com/s/files/1/0437/8358/5953/files/katujomiwatupokul.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/xosufabipo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/thomas_calculus_13th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/zabebomujefexitosam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/gold_gradient_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/muwufamabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5772/6118/files/bimobetumotidogowenajeti.pdf
    • https://medlineplus.gov/thyroiddiseases.html
    • 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_off00006143.bin
6fb15927622ee370a0dda250263ebf75802aa6510a105d33468fe0ce7732aafb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6143 5560 bytes
font_01_sfnt_off00007413.bin
8b7821ed211d4aff208c7b79149a982a66e121b7be742849fc09392661b101d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7413 10140 bytes
font_02_sfnt_off000096ac.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96AC 4324 bytes

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