Malicious PDF — malware analysis report

Static analysis result for SHA-256 1307707ba05ff714…

MALICIOUS

PDF

48.8 KB Created: 2020-08-11 23:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d6c320097dcb68eaf0d5e5b36a2ea7f SHA-1: 0d72c37d64dac172c9b51868bc100b1a06a97e92 SHA-256: 1307707ba05ff71411d626b7726b129846c77d17819d960d352180d4074eef2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute malicious content. The primary link directs users to a redirector URL, 'https://ttraff.cc/pify?keyword=ejercicios+numeros+primos+y+compuestos+pdf+4+primaria', which likely leads to a malicious payload. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a phishing or malware distribution 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.cc/pify?keyword=ejercicios+numeros+primos+y+compuestos+pdf+4+primaria
    • http://files.littleriverbc.org/uploads/1/3/0/8/130873779/robetafepepevar-fixolan-tilepix.pdf
    • http://files.integrativemassageworks.com/uploads/1/3/1/3/131380847/jopudekaxo.pdf
    • http://files.bac-massagetherapy.com/uploads/1/3/0/7/130776728/bomewuvomot.pdf
    • http://files.chapelcaravans.com/uploads/1/3/1/4/131453045/f8f0ddd36367299.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/10116546038.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/adverbs_of_frequency_exercises_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0769/files/zuvexigogapivitimitigepi.pdf
    • https://cdn.shopify.com/s/files/1/0440/4966/2117/files/notokuke.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/disud.pdf
    • https://cdn.shopify.com/s/files/1/0447/2838/5690/files/40429259435.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/zigepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30151397197.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/tg_moto_cross_4.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/61387049745.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066d7.bin
db3b3d3cbf701b4835a340cf343bb898674962d6b1491e4cbd5c0fd51cf54df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 5492 bytes
font_01_sfnt_off0000797f.bin
90276b6ae4ffc590d281de03e47c992ce4bffd6398140a2a35baf957dc7c762e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797F 11164 bytes
font_02_sfnt_off00009de7.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE7 16312 bytes

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