Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fbbbdb8b0ae37f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 14:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 068063659268f842bcb0d6e6bd75f1a6 SHA-1: b5f1443c44746f64a6bd0487c1353ba147899e80 SHA-256: 79fbbbdb8b0ae37f9f3d4712b23af0e439efac9caa264e62f44c84f9adff47c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.com/pify?keyword=bacharach+fyrite+insight+plus+manual, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other seemingly benign PDF links, suggesting a tactic to obscure malicious intent. The ML classifier also 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.com/pify?keyword=bacharach+fyrite+insight+plus+manual
    • http://files.swordplaystagecombat.com/uploads/1/3/2/6/132683142/xirudagikiwopi-gereronus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/apc_jeans_fit_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/58903333019.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/38407592959.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/buxegibomiwimuwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/saluwibofojorefogalari.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kerikelamizefebimu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/artificial_intelligence_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5974/8769/files/85719147843.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/sifogekemanijavejera.pdf
    • https://cdn.shopify.com/s/files/1/0428/2512/1959/files/mebefixerotukapulivadopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/dipikafitita.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004762.bin
742660fea34b1b598c2c8164e571763f78e98e19b550c7e0a2fc1ae693530fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4762 5352 bytes
font_01_sfnt_off00005976.bin
19dd76924a181e00575aa0babe26195e09967f356da303e3546a6152e2686c01
pdf-font-stream PDF embedded font (sfnt) at offset 0x5976 13256 bytes
font_02_sfnt_off000082a7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x82A7 4324 bytes