Malicious PDF — malware analysis report

Static analysis result for SHA-256 164cc3c40c8cab38…

MALICIOUS

PDF

43.4 KB Created: 2020-08-23 21:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5aab24af9edeae926c6ecb0df1c5837 SHA-1: d48eb106747b026ce2eba92d62e46d241352822b SHA-256: 164cc3c40c8cab38e80d247670851a3c1c8d94f5aacfb59e06051e478985e2dd
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'diamond plate aluminum sheets for sale' and a URL that appears to be part of a link farm designed to attract search engine traffic. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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=diamond+plate+aluminum+sheets+for+sale
    • http://darowof.nicolechinuntdet.com/uploads/1/3/1/4/131482950/tuvukudazetinaka.pdf
    • http://files.illustrationpad.com/uploads/1/3/0/7/130775583/60d2ba971a953.pdf
    • http://pexaniki.soucreativityconference.com/uploads/1/3/0/7/130776428/segikaxapi-dujora.pdf
    • http://files.compassionvet.com/uploads/1/3/0/8/130874474/detomase-dutizoxoxunesam-nomifesukovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/bansal_classes_organic_chemistry_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/bow_making_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/85891494469.pdf
    • https://cdn.shopify.com/s/files/1/0434/4925/4048/files/najojetivabazirog.pdf
    • https://cdn.shopify.com/s/files/1/0440/6021/3398/files/m_c_h_test_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/6614/6472/files/devizidatobepefaxepapa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4997/4946/files/implosion_apk_mod_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/25932014880.pdf
    • https://cdn.shopify.com/s/files/1/0440/5241/4614/files/alif_novel_complete_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/14896516220.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/remowatinuvakewup.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/apprendre_la_langue_francais_gratuit.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_off00005dc4.bin
eb2c68da3bfc913da3ebae60ac21d431a8df1e026be288431f0797b4ee7238ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC4 5164 bytes
font_01_sfnt_off00006f1d.bin
6a27e03ec327e9f5613cba1bf87b6fb8f6a21d33629cd8c8c46a595cb28d2586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1D 10312 bytes
font_02_sfnt_off0000925c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925C 4324 bytes

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