Malicious PDF — malware analysis report

Static analysis result for SHA-256 013a805bf18d47a8…

MALICIOUS

PDF

37.5 KB Created: 2020-10-09 00:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 46a8dd3a40cd48ed8bb238870fc2b75a SHA-1: 9538d5b6875d3f1f36c6f8a324ad3a2e5ea948b9 SHA-256: 013a805bf18d47a83a8d909cb512aea5b75219ad5196dcc4e669789b7d01f54e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://cctraff.ru/pify?keyword=best+way+to+get+mending+books+1.12', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, reinforcing the malicious intent.

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://cctraff.ru/pify?keyword=best+way+to+get+mending+books+1.12 In PDF document text
    • http://files.staceyhernberg.com/uploads/1/3/1/4/131407424/6041522.pdfIn PDF document text
    • http://files.robinharding.org/uploads/1/3/0/7/130738632/kiwoderubup.pdfIn PDF document text
    • http://files.drbriancasteels.com/uploads/1/3/1/4/131483955/b9183517663e3f.pdfIn PDF document text
    • http://files.itechteachers.com/uploads/1/3/1/0/131070186/momevutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53f6459-fc84-4e60-aba3-155b58aff13a/kovekirubabawijima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a65ca66-76c5-4258-b07f-2a4f00f08272/24260040986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562c6a34-b4a6-40b0-96f0-55c5847d7d85/87773359635.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/stick_war_legacy_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7088/9892/files/62620268080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8396/5619/files/bovunogofazibip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/88779000797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/malupunugomudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5106/0895/files/73254629257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3681/0152/files/kenmore_dishwasher_wiring_diagram.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_off00005270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5270 5680 bytes
SHA-256: cd5a218dd29e0f517e473f826e142e58f1dde746f22a9ba9524df121fb358ca0
font_01_sfnt_off000065e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E7 10208 bytes
SHA-256: e559d24f2825cbda15dd18d014134c3a6cf7eecd31bf144a2c86292e2353181d

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