Malicious PDF — malware analysis report

Static analysis result for SHA-256 2065d2a4216f9f13…

MALICIOUS

PDF

52.5 KB Created: 2020-08-09 11:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eed32c5e03f2c1b2891da28692560842 SHA-1: 66c9633b18ca78d92509bbbc09813e1d9da356fb SHA-256: 2065d2a4216f9f132f994bfb73816ddd9d0dd26e17f95711c0ad02054767e6f0
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which, 'https://ttraff.com/pify?keyword=bengali+calendar+2020+download+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to the same lure. The presence of numerous other links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to increase visibility of the malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=bengali+calendar+2020+download+pdf
    • http://bojonupo.georgevecsey.com/uploads/1/3/2/6/132681670/baea457b98cc5.pdf
    • http://files.photo-co-op.com/uploads/1/3/0/9/130969775/b0990d.pdf
    • http://files.yourlocalhandyman.org/uploads/1/3/2/6/132695636/1666867.pdf
    • http://files.mrober.com/uploads/1/3/0/7/130775232/0b9a56811f690.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/struts_framework.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/7_characteristics_of_living_things_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/13816258846.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/32046532592.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7068/files/kabota_snow_plow.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/glencoe_6th_grade_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/zetepimopezirupagunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/mujezubavakalate.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/english_consonant_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/kipowawoserixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4726/4166/files/14108830385.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_off00006c01.bin
91cfbbd954ce39c5fbb7e57700ace1bafaa973ccac5d60054af2b8cf6de4f78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C01 5560 bytes
font_01_sfnt_off00007f0e.bin
f0c00448b98a808a5802561c1cf291a7ce407f0fe4daf0979b4604add137bfcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0E 10876 bytes
font_02_sfnt_off0000a224.bin
771c2c03a1bd7705929ee84d3c03424df1d61b867c35dc89119f8aff33fe3962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA224 9976 bytes

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