Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a0e550eff8fc79…

MALICIOUS

PDF

32.1 KB Created: 2020-08-13 01:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03f6cdcc78d6e5fd508606b0c69c7893 SHA-1: 9f1f70376913e127ab89c4e858266a0e2c559525 SHA-256: 74a0e550eff8fc79df88a2b05185bc053b52d77695751dd56abdf64e55e03aa6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a link farm, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though heavily obfuscated, contains a URL that matches the redirector link. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to malicious infrastructure via deceptive content.

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.com/wb?keyword=maxi%20cosi%20zelia%20manual
    • http://files.condoriskadvisors.com/uploads/1/3/0/7/130738928/kagaxewubinos.pdf
    • http://vapisuwab.lowcountryliberals.com/uploads/1/3/1/4/131454526/632b4c9c7f4.pdf
    • http://files.vuongglobal.com/uploads/1/3/2/6/132681294/a35e9767.pdf
    • http://files.marianimediation.com/uploads/1/3/1/4/131406437/b7fec3857.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8924/8927/files/63320798979.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/35116075092.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/xazafavewijewele.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/8404223992.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/55984553038.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0791/files/resistance_tube_workout.pdf
    • https://cdn.shopify.com/s/files/1/0433/5684/8282/files/75308609194.pdf
    • https://cdn.shopify.com/s/files/1/0453/5566/3515/files/gre_psychology_subject_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/6432/8345/files/arabian_nights.pdf
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/boiler_tutorial.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_off000045db.bin
24c1cf68cec52ecbd241fa6904403a537a10ea5e7680cdc232e45ec74166311d
pdf-font-stream PDF embedded font (sfnt) at offset 0x45DB 4972 bytes
font_01_sfnt_off000056bd.bin
5b720272bc1d8c9c6e8f02788cf1d01cef4efc2c599a81e227383b44a641ca29
pdf-font-stream PDF embedded font (sfnt) at offset 0x56BD 8592 bytes