Malicious PDF — malware analysis report

Static analysis result for SHA-256 86625a947970650a…

MALICIOUS

PDF

79.5 KB Created: 2020-07-30 07:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf38ff30b6dd509920ff670b6284fe2 SHA-1: 171b4b728238960206771a55e9e9b75dc5ac87d6 SHA-256: 86625a947970650a03ab53c69fb160beb2752dab22ed335494bc9857d2267559
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged for containing a large number of external links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to lure users to malicious sites.

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=barrera+hematoencefalica+pdf
    • http://files.waterperryoperafestival.co.uk/uploads/1/3/1/4/131437685/551cd52a.pdf
    • http://files.equityallies.org/uploads/1/3/0/7/130740050/nukufalavupag-jamitavejux.pdf
    • http://files.icookyoudinner.com/uploads/1/3/1/3/131381706/fe51dc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5740/4318/files/52199346737.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/52800128318.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2508/files/tokepewam.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/virenejimowewikero.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/zililutifevofuximufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6796/files/55516341311.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/9369583066.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/nujaxatefubavamimejitux.pdf
    • https://cdn.shopify.com/s/files/1/0430/8146/6005/files/newilaxox.pdf
    • https://cdn.shopify.com/s/files/1/0436/4215/9257/files/rovivedozituwupa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/texuworupidutal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/1942989525.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4631/files/satexopoxitilelaxav.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_off0000e600.bin
0f2a9e9c6ea469331d93925b3f5a5297a40effd8f6ec37e7fdfe39b11db5a292		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 5052 bytes
font_01_sfnt_off0000f701.bin
1ceb5c3add36039148634fcc470f80191ceb4a7ab32e7b114ed890ff61b1c74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 10592 bytes
font_02_sfnt_off00011b53.bin
ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 16060 bytes

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