Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bae2a247f4c240…

MALICIOUS

PDF

46.7 KB Created: 2020-08-08 12:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c014ea12f18fb626b4ae49f4cf918b8 SHA-1: 537fac57ab31909d87c37e93f9818f463b2db57f SHA-256: 76bae2a247f4c240120296740acc590ecf679c899cdfbad835d80f89f8bf9d24
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for a 'power amplifier circuit design pdf' which, when clicked, leads to the malicious URL. This indicates a phishing attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=power+amplifier+circuit+design+pdf
    • http://files.hendersonbosley.com/uploads/1/3/0/9/130969681/0de62218.pdf
    • http://files.luketti.com/uploads/1/3/1/4/131452735/bisadujil.pdf
    • http://files.attherootvt.com/uploads/1/3/2/7/132740423/7528113.pdf
    • http://files.starryloveletters.com/uploads/1/3/1/4/131438557/sowor-lajiselomepe-najirajiluzu-nutis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8241/6281/files/zusolitajuse.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7762/files/71478202664.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/copy_string_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/34279416489.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/54341321224.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/27220471529.pdf
    • https://cdn.shopify.com/s/files/1/0436/1011/2163/files/barron_s_gre_word_list_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0440/7237/0326/files/26603315588.pdf
    • https://cdn.shopify.com/s/files/1/0429/1146/5638/files/free_act_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0435/0659/8040/files/149117664.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/stories_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/45047558776.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/mujol.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/vegovepoti.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_off0000688d.bin
0192a9ece5e21aaaca83ba2e84bdccc3e9b5d5b622febf1df08c64b7e9070cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688D 5452 bytes
font_01_sfnt_off00007b0a.bin
24c65c2e4bd3b9678f52e02c29a2b9e13c067cdf4c5e93496d255cd84f1585d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0A 10628 bytes
font_02_sfnt_off00009f53.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F53 4324 bytes

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