Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b4993e078fd994…

MALICIOUS

PDF

39.6 KB Created: 2020-08-09 23:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d0e3ddfcd3d6c96e62615932f3fe961 SHA-1: 7369765bf6cb2cd3bc76cfd213296e0ecaf2b56b SHA-256: 49b4993e078fd994c92438761eeea011dc54b25614c66a4e3c449e618860205b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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/pify?keyword=escala+de+apgar+silverman+y+capurro+pdf
    • http://files.diggersite.com/uploads/1/3/0/7/130776485/652feafa0d1.pdf
    • http://files.marinasouthpiermural2015.com/uploads/1/3/1/4/131407921/459456.pdf
    • http://files.cantstopforeveryimpala.com/uploads/1/3/2/6/132681969/danizujok.pdf
    • https://cdn.shopify.com/s/files/1/0440/7987/4213/files/88163388037.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutim.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/vorlagen_bautagebuch.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/4209448585.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/4666998607.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/yamaha_dtxplorer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/kinds_of_adjectives_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0437/7709/7886/files/75739954982.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/ayyappa_telugu_songs_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/draconian_ritual_book_asenath_mason.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b52.bin
1a43d4401d505c7f06d15c8d29b9ea280d835233324f9baa4e54b579f86ce9a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B52 5596 bytes
font_01_sfnt_off00006e5c.bin
c6fcca40b027b60a57dd4c03cf1186946befc13b0500722f21bb688105772ba6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5C 10344 bytes