Malicious PDF — malware analysis report

Static analysis result for SHA-256 68add8b7bfbbfaa3…

MALICIOUS

PDF

42.2 KB Created: 2020-08-14 05:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2668fe18159a3ad0e4611522183e8ead SHA-1: f12c5442f37c27f096a04a6ae3b54998cb7ca715 SHA-256: 68add8b7bfbbfaa3f83a5c32d8e87209ba58c5f4d8f588411e89353ddcb213ee
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to what appears to be a link farm designed to host SEO-optimized PDF files. One of the primary links, 'https://ttraff.cc/pify?keyword=wedding+shower+invitations+templates+for+word', is identified as a malicious redirector. The document body, though partially corrupted, contains text related to wedding invitations and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=wedding+shower+invitations+templates+for+word
    • http://vonuvuz.vermontventure.com/uploads/1/3/1/8/131856427/takeboji.pdf
    • http://files.raquelmeraki.com/uploads/1/3/2/7/132740860/3354846.pdf
    • http://files.vbtherapist.com/uploads/1/3/0/8/130814235/pokobegeli_kimajakufipeko.pdf
    • http://files.livingstongospelhall.org/uploads/1/3/0/9/130969211/3288746.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/takelukovevazetexoguji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/concerto_di_aranjuez_spartito_per_chitarra.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/find_command_in_unix.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/49700030219.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewugokujugiwiburonanas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/bridgeport_series_1_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/antihistaminicos_veterinarios.pdf
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/wazaroxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8039/files/velafeguzolix.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/7086044036.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5646/files/bakeripalezobibaretugek.pdf
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/21178523876.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/29132586360.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/subnautica_deconstruct_items.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_off00006624.bin
82503795b0997b7409eb34fcacceb9efabeda15dabe6c0dd7a7cf2cf9869dbb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6624 5620 bytes
font_01_sfnt_off00007938.bin
0fc6b588747074635706744be5450167fe0f14c837b23bb1024051b068508e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7938 10060 bytes

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