Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4bb79f0a9af73b…

MALICIOUS

PDF

55.1 KB Created: 2020-08-11 22:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 943eb94fc0f9221774b3d9a99f86df5e SHA-1: d7a186dd2eb89a6c2abb2f1f7d0c30104779b75c SHA-256: 6e4bb79f0a9af73ba66006f986b51a6417bf941575a669d783e75c36da2efff3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent link, 'https://ttraff.cc/pify?keyword=commercial+building+maintenance+checklist+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the 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.cc/pify?keyword=commercial+building+maintenance+checklist+pdf
    • http://lojupo.costamedicalmarijuana.com/uploads/1/3/1/0/131070767/574d0943.pdf
    • http://files.arvinminer.com/uploads/1/3/0/7/130738841/mexavurogib.pdf
    • http://files.clickitandcartit.com/uploads/1/3/0/7/130738903/xujupiwe-taripopajevimug-mabelogiziv.pdf
    • http://files.childrenscauseoc.org/uploads/1/3/0/8/130813985/8839112.pdf
    • http://files.jadewestbrook.com/uploads/1/3/1/4/131438419/b3ea8a610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fenajowogotuxukat.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/sivixetikurilad.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/nagekabilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/19769912612.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/39383558959.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/51600971665.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/kolivukemezodejomuzasir.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/51025161108.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/xuzemaginikixelotom.pdf
    • https://cdn.shopify.com/s/files/1/0438/0704/7840/files/mixurutibiwuwudadixopexop.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9561/files/chalean_extreme_meal_plan.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_off00009570.bin
3e71bf1e61c35e756274aed6f36250f34bcdb3da346b7e83094aa03da5396929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9570 5680 bytes
font_01_sfnt_off0000a87d.bin
34a444fa764d83b429fff1f618ec5d7d7f09290a4cae4217979a27a0c3170b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA87D 11588 bytes

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