Malicious PDF — malware analysis report

Static analysis result for SHA-256 7267ee0850f1d6fd…

MALICIOUS

PDF

37.1 KB Created: 2020-08-09 00:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c74d1b93c784f8117bd915f4a012667 SHA-1: 32a38870e9186cf481277179a89db3cadecd0856 SHA-256: 7267ee0850f1d6fd4fde2960412b1ab7198dde5d33ecb3561114bd20443575cf
154 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body also contains a direct link to the same malicious redirector, suggesting an attempt to trick users into visiting potentially harmful websites. The ML classifier 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.ru/pify?keyword=ashrae+handbook+hvac+applications+2020+pdf
    • http://files.solalpine.com/uploads/1/3/1/4/131409305/8618510.pdf
    • http://files.kappahouseonprospect.com/uploads/1/3/1/4/131437984/rumiwazufego.pdf
    • http://vojuduwuf.dvowfoxvalley.org/uploads/1/3/0/7/130775732/bufulikipelokazutej.pdf
    • http://files.whistlingfrogresort.com/uploads/1/3/2/6/132681002/masaberilanimubaloji.pdf
    • https://secufiles.com/52hd/Standard_form_select
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/xekulekuviguto.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/absurd_person_singular_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/wuvunujagafakuvoxonufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/kizanunaziguwaseku.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9066/files/pdf_to_word_converter_mac_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/80305005510.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/pakinejazikizamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0968/files/koxuxupupewesomigamupofov.pdf
    • https://cdn.shopify.com/s/files/1/0432/0906/4607/files/dnd_warlock_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/91133556714.pdf
    • https://cdn.shopify.com/s/files/1/0429/2889/8211/files/aditya_hridayam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/ferezu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/34948753689.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ccf.bin
e74c39dfcd0a081b545ef766dfc5c4ee430f31a03b8a6526d775c30ef295bd30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CCF 5772 bytes
font_01_sfnt_off00006071.bin
ca2d16b8b6cf223a742856cecb143546b6f1671b1057b8b685d3d47616d96d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6071 13556 bytes

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