Malicious PDF — malware analysis report

Static analysis result for SHA-256 028187f5849c1288…

MALICIOUS

PDF

61.7 KB Created: 2020-08-03 15:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d0f8e567e22b0a439dde0ac89ff57cd SHA-1: 757413ec16b35d44c187424f06fa7155eda6f766 SHA-256: 028187f5849c12885a202bc4a43414b3f4b27140be8b3d6bacce1a45e029d744
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with the primary one directing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The presence of a link farm and a critical redirector firing strongly indicate malicious intent.

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=abstract+algebra+questions+and+solutions+pdf
    • http://files.illlaladesigns.com/uploads/1/3/1/4/131406412/tifozujugupomed.pdf
    • http://xiwut.themerchantsofvenus.com/uploads/1/3/0/7/130776031/9641063.pdf
    • http://files.gracekutztown.org/uploads/1/3/1/0/131070231/1422585.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/61007863665.pdf
    • https://cdn.shopify.com/s/files/1/0440/0968/5157/files/11585025692.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/vawadevodimetalez.pdf
    • https://cdn.shopify.com/s/files/1/0437/1228/2789/files/levowowux.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8852/files/zafiwugamawijobot.pdf
    • https://cdn.shopify.com/s/files/1/0438/5023/6054/files/79641019396.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6006/files/rugadoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/sasuzivoxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/86856651977.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/vidavexozasawolizakape.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009767.bin
735e22c8b3dc7fd34f0d2cd2e6599b3bf44764839b71d8f5054dc0eb21816981
pdf-font-stream PDF embedded font (sfnt) at offset 0x9767 5576 bytes
font_01_sfnt_off0000aa4b.bin
79c72fbd033974fd482492cf92f9c059c3d566d950d0586622dc60d581628590
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA4B 6620 bytes
font_02_sfnt_off0000bbd8.bin
18151ab0fa7c557fc29842d7d71c84a4d601198aa084c8b0be84cd61ada658e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD8 14240 bytes