Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e48979fbfd67b21…

MALICIOUS

PDF

56.2 KB Created: 2020-07-31 05:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6c755f73885737621ebab9f5057485 SHA-1: d3da903285fd11177b05fe71e5f141ead66c6857 SHA-256: 6e48979fbfd67b2174d154d011979ec96cf49bc3f83bf4081b036b50ef0789a1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files, indicating a link farm or SEO manipulation tactic. One URL, 'https://ttraff.cc/pify?keyword=bardo+thodol+completo+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and URL patterns suggest a malicious intent to redirect users.

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=bardo+thodol+completo+pdf
    • http://files.lindveit.com/uploads/1/3/1/4/131406744/2671369.pdf
    • http://files.fantasticfrocks.com/uploads/1/3/2/7/132740905/zanebaw.pdf
    • http://files.downingcommunityadvisors.com/uploads/1/3/1/3/131397971/nibevofifaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.thdl.org/http://www.thdl.org/Tibetan
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/fimabapajejepafudejiliwu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7430/3640/files/rorukuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/92422443543.pdf
    • https://cdn.shopify.com/s/files/1/0436/9511/2347/files/88883239446.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/nemabisupitet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0363/3051/files/torijenujujalak.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/93570831126.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/verenojogadinojexedorotu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/fobir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51507598499.pdf
    • https://cdn.shopify.com/s/files/1/0430/6088/7705/files/dujanivujapub.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/40050198188.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
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.htmlTibetan
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007435.bin
866b2a9193cae5de00beab900f11d4e461286c08934772f7b5944ef35b8c3090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7435 4900 bytes
font_01_sfnt_off000084e6.bin
863dc41a3f31cd8e45c8d6b5a329202f4e3c921affd48cd23369465afd107e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E6 11852 bytes
font_02_sfnt_off00009f25.bin
0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F25 6148 bytes
font_03_sfnt_off0000af05.bin
49e9b1a60498123fd1cfa9af76f7cdcf16c9c42a0185506e4c7cfc688c2d39d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF05 10772 bytes

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