Malicious PDF — malware analysis report

Static analysis result for SHA-256 812aca5a1bed79b5…

MALICIOUS

PDF

46.8 KB Created: 2020-08-15 02:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82c779c75c10e3e6f0edd919fa74a147 SHA-1: 25cfc6b715894422097959966a1d7264644b16a6 SHA-256: 812aca5a1bed79b53c1eb966d22b2e77a5eef6059b9386f7524e0ff94b9773ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector link pointing to malicious infrastructure, indicating an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious. The document body contains text related to a PDF download, reinforcing the lure.

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/wb?keyword=basic%20medical%20endocrinology%20goodman%204th%20edition%20pdf%20download
    • http://xogarenu.garnerbass.com/uploads/1/3/1/4/131407440/leniwokonefupus.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/vumelekoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2866/7816/files/stuffit_expander_mac.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/bopob.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/filipino_knife_fighting_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/64437175843.pdf
    • https://cdn.shopify.com/s/files/1/0433/1493/8014/files/defined_and_undefined_terms_in_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/26332849745.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/89200956269.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/selinasapedug.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_off00006d58.bin
0297fe122cadb3576b993b0ffbe7ad37f917d0dc05d284c17f572152ad3959dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D58 2184 bytes
font_01_sfnt_off0000770f.bin
2608471b2276f0cce40d2e57441bda02154aef80a48151486fe729b2cccb2678
pdf-font-stream PDF embedded font (sfnt) at offset 0x770F 5900 bytes
font_02_sfnt_off00008b0e.bin
4fd09ba011afb042cbc7759117cdfb230f30b96a7bac2954ed44ed48d1ed75f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0E 10196 bytes