Malicious PDF — malware analysis report

Static analysis result for SHA-256 84401fa1557981d2…

MALICIOUS

PDF

63.1 KB Created: 2020-09-06 04:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72ca9aa57db40f534787ce095b977c4a SHA-1: c40652761af302394640ff3968ea3671fb3c856a SHA-256: 84401fa1557981d2c63820809d8673055d9b4b408550baac0e772de66fc01d03
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=cse+in+text+citation+guide', likely leads to a phishing or malware distribution site. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, suggesting an attempt to manipulate search engine results or distribute content through a network of sites. The ML classifier strongly indicates maliciousness.

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.link/wix?keyword=cse+in+text+citation+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/75707339900.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4585/files/zaweguvojinaw.pdf
    • https://cdn.shopify.com/s/files/1/0468/8173/4813/files/risk_matrix_template_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/67387944474.pdf
    • https://static.usrfiles.com/ugd/e02969_6a82a83cf5554d0db4a71324a9a2eff6.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc2df725d53a4123ae0e48095199d0fb.pdf
    • https://static.usrfiles.com/ugd/f103bb_8d92bcd023f14026851acce40613d785.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/equality_and_diversity_policy.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/puboxo.pdf
    • https://cdn.shopify.com/s/files/1/0461/7437/1993/files/attack_on_titan_tribute_game_multiplayer.pdf
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/56711582402.pdf
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/comprehension_skills_worksheets_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/zubenarisomesodivaxof.pdf
    • https://cdn.shopify.com/s/files/1/0470/9895/3878/files/subiwifikoborag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad2c.bin
6ca6bf523c17d2eda914ef8adf64a92b109b4f7db4236e7045384e41efcb8cbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2C 4952 bytes
font_01_sfnt_off0000be1a.bin
87fcc11a6d52227caffefa4140ad5d1ded733d7bc13754ec662c23875f2c07c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1A 10208 bytes
font_02_sfnt_off0000e10e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 4324 bytes

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