Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb39edac175feb79…

MALICIOUS

PDF

57.9 KB Created: 2020-10-02 08:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a85e42cc318a89a1f23ecd14e64f3ef2 SHA-1: 6d3483c2c2db1fd8a4bfb610ce0c83f9d92f75f2 SHA-256: bb39edac175feb7909a670a0d530203f1a242dbe2f78f7b9c23de5ad9f6f2377
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a malicious intent to manipulate search results or redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious document, likely used as part of a phishing or SEO spam campaign.

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.com/pify?keyword=reciprocal+membership+museums In PDF document text
    • https://site-1039886.mozfiles.com/files/1039886/68047319344.pdfIn PDF document text
    • https://site-1040386.mozfiles.com/files/1040386/sokevavuretu.pdfIn PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/fubifukupezedag.pdfIn PDF document text
    • https://site-1036656.mozfiles.com/files/1036656/lesabemiz.pdfIn PDF document text
    • http://xodop.jessietaylordesigns.com/uploads/1/3/0/8/130814328/wikalo.pdfIn PDF document text
    • http://wozemados.kevinkochdriftlessland.net/uploads/1/3/1/4/131406821/zopima.pdfIn PDF document text
    • http://files.swtcreations.com/uploads/1/3/1/0/131070846/zisosexoronan-zutadenog-wabamelojodaz.pdfIn PDF document text
    • http://files.pullpal.com/uploads/1/3/0/8/130813606/450b447958cc97.pdfIn PDF document text
    • http://gepej.yogadiversityinitiative.org/uploads/1/3/1/4/131437261/laroli_pezogijavamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0284/2264/files/loxegamalasal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2906/5639/files/kamilelibawodudiwug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2394/4858/files/luginofapegut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9033/7174/files/intraspecific_competition_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3751/0817/files/hughesnet_pay_bill_phone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/dilepujixefizelowanamiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7136/9116/files/mtv_splitsvilla_13.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2947/9072/files/simple_harmonic_motion_gizmo_answer_key.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9760 5320 bytes
SHA-256: 2f9e54f1bbe6d87810ca0ee80660ef320b99d95818c8d2bd0bba82f02f0fd104
font_01_sfnt_off0000a948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA948 15884 bytes
SHA-256: 635a8064c12ae6c4a0563355658dd32bac1984b5ae25f1741cd967c9ea62fb1c

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