Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11162d9a064441e…

MALICIOUS

PDF

36.3 KB Created: 2020-11-01 14:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ba54a4ac3a59bc0b516d99d4fe1535ed SHA-1: 179f94c1b2c93a8f4c538e23036b197fa9bc255e SHA-256: a11162d9a064441e356d3b2e496ee185885c57b364245d50b89f246a9bd0a713
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, a technique often used for SEO link farms or to distribute malicious content. The primary link directs to a known malicious redirector, and the document body contains obfuscated text and URLs, suggesting an attempt to disguise malicious activity. The ML classifier also strongly indicated 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.com/123?keyword=words+start+with+bam In PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/b6bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8738223eaa1.pdfIn PDF document text
    • https://tefifegewa.weebly.com/uploads/1/3/4/3/134335978/lusujakis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_5f98574d1d043.pdfIn PDF document text
    • https://tokuguzeg.weebly.com/uploads/1/3/4/4/134464653/6864848.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/1/0495/6310/7480/files/55227694055.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7706/7448/files/tudatinimisegemonogevede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/3979/0518/files/poetry_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8963/4483/files/cc_loi_bnh_nng.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/zixesilusikiro.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/learning_javascript_design_patterns_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/71566536975.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/75759819596.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/zozijuzumopoloruvolifafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/3274/8447/files/48488610416.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_off00004e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E57 5280 bytes
SHA-256: be93938858c37bd66af94558dbd8b9fe3baf4258651323b9a629a5c1f34d3f42
font_01_sfnt_off00006032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6032 10848 bytes
SHA-256: 8d6fd0e891e64c612cb46a22a6856efcd19a2982381e645c12029bc6352149b4

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