Malicious PDF — malware analysis report

Static analysis result for SHA-256 6899eacca84e6aff…

MALICIOUS

PDF

35.1 KB Created: 2020-08-26 19:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 897e2e808c23189fe4fda6dff127ee00 SHA-1: 19173cf8d41fcde49c8ddac973e6e6ab8920a064 SHA-256: 6899eacca84e6aff81b44ac06cc01e650735dae62670130f1e18ac886e55d389
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.club/pify?keyword=the+ultimate+guide+to+sat+grammar+3r', which is also flagged as malicious. The presence of many external PDF links suggests a link farm or a method to obscure the true malicious destination.

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.club/pify?keyword=the+ultimate+guide+to+sat+grammar+3r
    • http://files.gotnlc.com/uploads/1/3/1/4/131437307/lijerelekezuzitif.pdf
    • http://files.trendytutusbylauren.com/uploads/1/3/2/6/132683014/rafesive.pdf
    • http://files.sarasotacommunitychurch.org/uploads/1/3/1/4/131483143/9bb3b724b.pdf
    • http://files.heatherfraser.ca/uploads/1/3/1/1/131164009/tibug_wajefiwa_nibogepepuna_numewagugor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/jozorifedeki.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/resegenivusoruzobomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8111/3506/files/if_i_tremble_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/7948437456.pdf
    • https://cdn.shopify.com/s/files/1/0427/5883/2294/files/kim_possible_capitulo_2_parte_1.pdf
    • https://cdn.shopify.com/s/files/1/0461/9812/8791/files/girupujekexugefi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/wezigakirofukenafe.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_off00004b7f.bin
259faebb4a8538c2cbb809c46cfb24ff98e49939b19cf2c7906433298a0cbc09
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7F 5352 bytes
font_01_sfnt_off00005d88.bin
3de0d4cee344fadb8c16cf8cb124d787ff050cc9f66718230dad24c1999dd4f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D88 10240 bytes