Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9b3b1b555202ef…

MALICIOUS

PDF

57.9 KB Created: 2020-08-11 22:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fa95031c58d9fabeaad7cce52bec716 SHA-1: 75a819cf717e17925edd13ea553926746b6ff338 SHA-256: 0e9b3b1b555202ef4bc2177885ebdcffe8a5dc64e5417e4b4706e391a23c46b0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.ru/pify?keyword=joint+probability+distribution+function+pdf', suggesting a phishing or redirection attempt. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious content.

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=joint+probability+distribution+function+pdf
    • http://files.eygbball.com/uploads/1/3/0/7/130738859/e4297afe7f04a0.pdf
    • http://files.wessworldwide.com/uploads/1/3/2/8/132815753/vixexunobumige-vufukatetumax-fabunadu.pdf
    • http://files.annieleezimerle.com/uploads/1/3/1/6/131637224/6593942.pdf
    • http://files.nplservicesinc.com/uploads/1/3/2/7/132710748/2581563.pdf
    • http://xamasama.donnahebertdesign.com/uploads/1/3/1/0/131070571/c673ec19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4455/2354/files/tagisuronarivujinifunu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7757/3539/files/sonepulusofosuvutazoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7620/files/bogizefiraxoluxatoxoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutiga.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/xapedojiwupogabemasivewu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/93233520737.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1329/files/jimafurolowozat.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/college_physics_openstax_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/wurafuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/pikutusit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0378/8960/files/nodopogojapes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/litobo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4008/files/bhagavad_gita_slokas_with_meaning_in_telugu.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_off000083c4.bin
fe146bbc290866682afc5342c8bcf90e338c1a3732f07dba13e6316de9a7b890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C4 5380 bytes
font_01_sfnt_off00009615.bin
0d3be937b75e91a457beb45bebe0e1dada7fb77576c8f1968ae8437dd1e598ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9615 14500 bytes
font_02_sfnt_off0000c3fc.bin
90175e06d18cc84f4eb8a62517578c3b486065994ca9aaa107a1f48398bdc3bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 16268 bytes

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