Malicious PDF — malware analysis report

Static analysis result for SHA-256 6870f4393d3d5156…

MALICIOUS

PDF

38.1 KB Created: 2020-07-29 14:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 054ebdbe2ae1dacb21b2fb842e361ffd SHA-1: 67dcf14743a524b5c422c7ccc04fd8b8a3a40b90 SHA-256: 6870f4393d3d5156530293a6af68082af2fca7568fee3d4428aa42a28b74ad99
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a free PDF to Word conversion tool, which redirects to a known malicious domain. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL strongly suggest a phishing or redirection attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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=convertir+de+pdf+a+word+on+line+gratis
    • http://files.angelascreativecatering.com/uploads/1/3/0/7/130739404/jedolitosazow.pdf
    • http://files.aquadogsports.com/uploads/1/3/1/4/131453127/degufog.pdf
    • http://files.collegeclubofhartford.org/uploads/1/3/2/7/132741176/puxegedad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bagubiginapir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3965/files/65095434114.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/somonijezebaro.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/kiduruzosexanowo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/gubipapajumikiwan.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/94942323557.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/99561152162.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/dimurexidufolevijafolito.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/zasaladupobanutemibenina.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/fivonujufozitubifirukeko.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/54574036008.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/wasojopesopewiwanet.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_off0000587b.bin
d3258ad8aef4297fad3d92f2a20fb85152d1d0c242d1491949c43024432f1fc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x587B 5172 bytes
font_01_sfnt_off00006a36.bin
6ae60e9837b00822cb6c0bcf0bec0efcea12044681b502efc632b7f5520e55c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A36 9764 bytes