Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9011e1026eb710…

MALICIOUS

PDF

42.3 KB Created: 2020-07-10 19:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfbe9b1b0f492001406e77ca61755ae3 SHA-1: 31c7732d63d7f74e8017f3db665e14cc86b25737 SHA-256: da9011e1026eb71026081d5b4a45062862944b5c5968cafb39f31776a93dd5dc
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary link, 'https://ttraff.com/wb?keyword=canticos%20espirituales%20pdf', is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL and others, suggesting a link farm or SEO poisoning tactic to direct users to malicious content. The ML classifier strongly flagged this PDF as malicious.

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=canticos%20espirituales%20pdf
    • http://files.washington-scottish.com/uploads/1/3/0/8/130874318/8b0f395751b7b3.pdf
    • http://files.clydeaspevig.com/uploads/1/3/1/8/131872285/aae943a5.pdf
    • http://files.heartofillinoisorff.org/uploads/1/3/1/3/131379371/9586210.pdf
    • http://files.cardionrcc.com/uploads/1/3/0/7/130740090/7388e.pdf
    • http://files.patricialino.com/uploads/1/3/1/8/131871480/238345.pdf
    • http://files.simplifiedbybobbie.com/uploads/1/3/0/9/130969754/4078161.pdf
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdf
    • http://files.reikiwithlouise.com/uploads/1/3/1/4/131482808/77a7331299331f8.pdf
    • http://files.nowwelive.com/uploads/1/3/1/4/131483440/d1fe67fbaae4b7.pdf
    • http://files.tantrumhouse.com/uploads/1/3/1/3/131398357/267878dcb6a0.pdf
    • http://files.sopoochtraining.com/uploads/1/3/2/8/132815961/kawivibugakovuj.pdf
    • https://labupuli.files.wordpress.com/2020/07/mojitawowitufemizokureduj.pdf
    • https://rixunabir.files.wordpress.com/2020/06/1997973412.pdf
    • https://nidiximas.files.wordpress.com/2020/06/83667844910.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/rimim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vonabubabosutogoxofe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/vizelilelupujonojokix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72438278193.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/nonewevifubafake.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25618010541.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000684e.bin
27686f000e27244936c5d014feff0868a16b07a9c9f6fb731d0c7a361bdef309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684E 5052 bytes
font_01_sfnt_off00007986.bin
33527fbfcc078216c3917994a1e3115b45a6ebd66acc42101235065f8dac112e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7986 10176 bytes

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