Malicious PDF — malware analysis report

Static analysis result for SHA-256 192f7918ce5fae2c…

MALICIOUS

PDF

43.4 KB Created: 2020-08-07 23:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9086ddfd7ff04e3b0f5db23f6c04bd55 SHA-1: 5e93c2431b477415b8842281fb278c3cbfd5db13 SHA-256: 192f7918ce5fae2c7a45684ed6139d75efc203b3ba43d2e8ba9d502fae516681
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for distributing malware or leading users to phishing sites. The document body, though heavily obfuscated, contains the same redirector URL and several other URLs, many pointing to Shopify, likely part of a link farm to improve SEO for malicious content. The presence of a download button lure further supports the malicious intent.

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.ru/wb?keyword=air%20force%20y%20group%20question%20paper%20pdf%20download
    • http://files.carpenterschool.org/uploads/1/3/1/4/131483361/8061639.pdf
    • http://vuzido.apayoart.com/uploads/1/3/0/8/130874284/51debcda2a647f.pdf
    • http://files.silverfoxpottery.com/uploads/1/3/1/4/131407802/woburunukud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/7618104953.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/zukifurovajanopawoxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/sipigijejesogif.pdf
    • https://cdn.shopify.com/s/files/1/0435/7616/4515/files/fluid_mechanics_white_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2712/8735/files/66245942756.pdf
    • https://cdn.shopify.com/s/files/1/0429/6559/8364/files/pathophysiology_of_myocardial_infarction.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/72586291817.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/abnormal_psychology_barlow_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2416/1704/files/assessment_procedures_for_counselors_and_helping_professionals_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/jetepejulagerijerefape.pdf
    • https://cdn.shopify.com/s/files/1/0436/5585/6281/files/kodak_esp_office_2150.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_off00005c86.bin
05c7e2cc1b6c754cf522d056428b9f2adc1392b5bb8a10eb442d7d099686d5f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C86 5632 bytes
font_01_sfnt_off00006fdf.bin
c4fceb7b132dd8950a51cab894e8cf43af77dc7d31ccc4e4e03dbb9678984bd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDF 10260 bytes
font_02_sfnt_off000092f8.bin
a29041989fc328615323ee4eba452f56691b7d20c3ae22c6464357b47f37bd2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F8 2832 bytes

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