Malicious PDF — malware analysis report

Static analysis result for SHA-256 81995c78531e5f76…

MALICIOUS

PDF

42.2 KB Created: 2020-08-07 22:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 922876a9ca643495fe7eb2e6ef108504 SHA-1: c3a71577c73d03757a79b109e2ddf459b6b76597 SHA-256: 81995c78531e5f7674a2b353b317f1455d18170514abc4856416f450fd8d2d7b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. The primary URL, 'https://ttraff.cc/pify?keyword=baseball+tee+drills+pdf', is flagged as a malicious redirector. This indicates the document is likely a lure to redirect users to malicious content, possibly for phishing or malware distribution.

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=baseball+tee+drills+pdf
    • http://files.jacksfurnitureplans.com/uploads/1/3/2/3/132302768/likufof.pdf
    • http://files.cchva.org/uploads/1/3/1/8/131856949/mogabamasipek_kofejugiz.pdf
    • http://files.highlandlakesquiltguild.org/uploads/1/3/0/7/130739069/658034.pdf
    • http://files.rosemearshelties.com/uploads/1/3/0/8/130815009/5995014.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/dodulop.pdf
    • https://cdn.shopify.com/s/files/1/0431/7875/4199/files/deginojivewimiridet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8145/7061/files/58761502485.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/count_complete_tree_nodes.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/synonym_for_first.pdf
    • https://cdn.shopify.com/s/files/1/0440/1741/8405/files/prompton_state_park_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/12795103948.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6206/files/dezitexezam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4191/4006/files/tukumupepaxe.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_off00006915.bin
598ccb719acf96165a42a4a0533bf2d99514fff6822b67e80117df48f9df284a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6915 5224 bytes
font_01_sfnt_off00007adc.bin
e9cc1ce0bcdc70e38b7c2e7441decc54775791b001d81ebf5e859bf2e06e7927
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADC 9656 bytes