Malicious PDF — malware analysis report

Static analysis result for SHA-256 631b70750baf0c2f…

MALICIOUS

PDF

75.7 KB Created: 2020-10-30 00:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0f8a01f12cc0b3815ac4936e43cc0900 SHA-1: dfb41ebb791a6a36fdbf15b8dfc78ab4f52e18cd SHA-256: 631b70750baf0c2fdf3a5d9ed4af4dd27fa780a8c7111f10c64d6d8fb49b5032
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/strik?keyword=john+steinbeck+the+harvest+gypsies In PDF document text
    • https://togasiwivote.weebly.com/uploads/1/3/4/3/134370981/4fcc9195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f8b07fc3987e.pdfIn PDF document text
    • https://morozosewiveloz.weebly.com/uploads/1/3/4/3/134387595/jibebiwekelenetoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f8e61017729a.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/gedeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5f8bf8afb0af4.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/tevin-jozowitup-jaworig.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.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/1/0429/5488/3231/files/mage_leveling_guide_3.3_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/9910/8521/files/food_matters_holly_bauer_2nd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3699/5495/files/luwigaxaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7257/8244/files/wilhelm_busch_max_und_moritz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5738/1027/files/6933434026.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5269/9300/files/plant_growth_and_development_class_11.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_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 5516 bytes
SHA-256: 02fae961dc19cd0978dd93e9872fd3d40ed680087381d9b8359449f8c9864f45
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 13984 bytes
SHA-256: 79326ca4a317d14c4d50a7ff33673e6a5aa5e53dd5972a1da38bd9d2a55b50b6

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