Malicious PDF — malware analysis report

Static analysis result for SHA-256 190dd113eb9c528b…

MALICIOUS

PDF

57.0 KB Created: 2020-07-22 04:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a44fb7a14f5eeed371d711058739da5f SHA-1: 5e510976ed34753ba17b7a44359f08f89f85894c SHA-256: 190dd113eb9c528ba459618479134299154b96f8e31b8386fc7eae1f3c153380
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, designed to redirect users to potentially malicious websites. One such redirector URL is https://ttraff.com/pify?keyword=feed+conversion+ratio+formula+poultry+pdf. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to lead the user to external, untrusted 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.com/pify?keyword=feed+conversion+ratio+formula+poultry+pdf
    • http://files.jeannienadjastudios.com/uploads/1/3/1/4/131408103/genulubim-rexupixe-tajotureluz-farupukinabiwew.pdf
    • http://files.daisiesandchalk.com/uploads/1/3/2/6/132682685/zatuzefavarogun.pdf
    • http://files.legacygiftofmusic.com/uploads/1/3/1/4/131452942/cec44274bec45ee.pdf
    • http://files.riverridgebaseball.com/uploads/1/3/1/4/131407061/48cd29f186e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/xetap.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/sezafovimaxuzuwozuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6771/files/13976289655.pdf
    • https://musemutu.files.wordpress.com/2020/07/38380835651.pdf
    • https://lasajuxile137814360.files.wordpress.com/2020/06/4063619523.pdf
    • https://bigavar.files.wordpress.com/2020/07/nikobedodepabagugij.pdf
    • https://putonabewus.files.wordpress.com/2020/07/87666282388.pdf
    • https://miweven.files.wordpress.com/2020/07/gejiwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/bitibajobuzasigujamifesog.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7968/files/85193573048.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/68027147152.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/71057024495.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/17284943493.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/febejusiloxuxugejax.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_off0000a06a.bin
db1ad92ff2f9c88d571553c16d18a3a70f756feee648adc1925f4710a03e8458		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA06A 5300 bytes
font_01_sfnt_off0000b25a.bin
59c00e0d494f89adc97c7cee85fb08815abb094f5db9c0bdc3d994a789d8eda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 10516 bytes

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