Malicious PDF — malware analysis report

Static analysis result for SHA-256 655bdc202f05ee1c…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 17:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba1248905e3cb086fde0b5a1d3d35c58 SHA-1: d61ff6c1a51b339086b33219b359b865f63444f8 SHA-256: 655bdc202f05ee1cf113ee2ad921ecc0846ad0fa8ab353c6a4390ad46768257e
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to various external resources, with one primary link identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that initiates this redirection chain. This suggests an attempt to drive traffic to potentially malicious or unwanted content, likely as part of a phishing or spam campaign.

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=aprendizagem+organizacional+pdf+concurso
    • http://files.theverdictomaha.com/uploads/1/3/0/9/130968984/pepudinetelinusaxip.pdf
    • http://files.bespokecounselling.net/uploads/1/3/0/7/130739713/2132456.pdf
    • http://files.lashondabarnett.com/uploads/1/3/2/3/132302921/0f90b9b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/gubikilagigitiwil.pdf
    • https://cdn.shopify.com/s/files/1/0427/7587/1654/files/38966529781.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/xudaxolijixos.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/32948575205.pdf
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/kifukajalameji.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/animal_farm_summary_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/82613377779.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1098/files/fopumuwevumajovufukobiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9970/files/37954939410.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/the_way_of_the_wolf.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_off0000646c.bin
bd7d2123888dce2ea27f253c59c15d1ffb4b20f12327b38f39bfb8289c704076
pdf-font-stream PDF embedded font (sfnt) at offset 0x646C 5512 bytes
font_01_sfnt_off00007723.bin
4186b0d8c2e733c4aca8067435ae1e926aba095ab4b3e6cc0b217e2f882876f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7723 10624 bytes