Malicious PDF — malware analysis report

Static analysis result for SHA-256 5412e2aa32a6f91c…

MALICIOUS

PDF

51.9 KB Created: 2020-08-11 19:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 033f234436c000f18dc260bc41b169a3 SHA-1: 0faf38e72f09377e3894e8f301040c37df0ad0ba SHA-256: 5412e2aa32a6f91cf101b7051af9ab828917f182392431b516524dbdfeb8bc95
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, with one specifically identified as a malicious redirector. The presence of a PDF link farm suggests an attempt to lure users to malicious content through a deceptive document. The ML classifier also strongly indicated maliciousness.

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=ancylostoma+braziliense+pdf
    • http://files.mectacprinstructor.com/uploads/1/3/1/4/131437740/2f469132278.pdf
    • http://files.seasidecdc.com/uploads/1/3/1/4/131406149/nuvelunaroketo.pdf
    • http://files.littlefeatherfoundation.com/uploads/1/3/0/7/130775393/likodozezow.pdf
    • http://files.natecareymusic.com/uploads/1/3/0/8/130873893/pabukixemi_roworim_tupunakepu.pdf
    • http://files.nocra.com/uploads/1/3/0/7/130776511/b26fc2504053.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/31655887151.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikas.pdf
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/lagilululewos.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/97511447823.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/nubusitapuji.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/cetoprofeno_gotas_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/3468/1250/files/how_to_become_more_intelligent.pdf
    • https://cdn.shopify.com/s/files/1/0437/4305/1937/files/rolawebutifalo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/berajaladur.pdf
    • https://cdn.shopify.com/s/files/1/0438/4446/8896/files/modern_technology_used_in_agriculture.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_off00007f36.bin
ba60036d4db135fdafea21cd57ed409297c81a1bd32bd710475fe251d0a201c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F36 5372 bytes
font_01_sfnt_off0000915a.bin
2834905db8f00ee16390b0b552aff88b5a823d8f731c5c6faadcd1350a88b329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915A 10356 bytes
font_02_sfnt_off0000b481.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB481 4324 bytes

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