Malicious PDF — malware analysis report

Static analysis result for SHA-256 809c1a28bbe450b1…

MALICIOUS

PDF

68.5 KB Created: 2020-08-11 17:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4012622c9643d3dc0c62bdccfb0bce9d SHA-1: 1ce4bf802081ff892715477d48296f4523033907 SHA-256: 809c1a28bbe450b1d167860af1a08890491fb8de97c92da17321380a2090bf1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is https://ttraff.com/pify?keyword=artificial+neural+network+using+python+pdf, which is flagged as a known malicious redirector. The document body itself is heavily obfuscated and contains a mix of seemingly legitimate text and the malicious URLs, suggesting a lure to a malicious site.

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=artificial+neural+network+using+python+pdf
    • http://files.boatinsurance.wales/uploads/1/3/0/9/130969061/1329093.pdf
    • http://files.hummingbirdwordco.ca/uploads/1/3/0/7/130775980/galivikewapu.pdf
    • http://files.amyjgardiner.com/uploads/1/3/0/8/130814003/479bfbec271.pdf
    • http://budadog.midvalleydoulas.net/uploads/1/3/0/7/130775320/xofoluwabidela.pdf
    • http://files.krismcg.com/uploads/1/3/1/4/131406800/mebekovejanelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/13619832270.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/68244626796.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/74955535021.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6558/files/addictive_thinking.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/juxumadebamapetutorobegew.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6050/files/puzidigemo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3834/2311/files/23117491227.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/40771619380.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/adjektivdeklination_bung.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4458/files/25532959601.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/neweloziwasupi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0422/files/8036493508.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/duwaxufezemurogagur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7688/6431/files/88419113490.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_off0000b41c.bin
ca7119e427167f2222b2c122c05287d0eedc6fc3f756ecaea1dd5f1300e0dbd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41C 5664 bytes
font_01_sfnt_off0000c773.bin
632197c011ad67717cec1dd396a8b98aa5a1103d477ed730ee01e5f093c7bb43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 10672 bytes
font_02_sfnt_off0000ebea.bin
32a0c0f2838f28f32967bcc7426625b609566e18730859798cfe54c31243abe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 17040 bytes

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