Malicious PDF — malware analysis report

Static analysis result for SHA-256 272d716d7f2c2074…

MALICIOUS

PDF

119.7 KB Created: 2020-10-30 12:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cd440fe6eff8470c12aa0b534b476406 SHA-1: 9621a1cc69c1ddfc94f56f9a77456e343a317a4b SHA-256: 272d716d7f2c2074e6304f58af64c296a97fbe2474eb33c5cc98184a8aabf87d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of external links, many pointing to what appears to be a link farm designed to host malicious content. One prominent link, 'https://ttraff.ru/123?keyword=swoffers+mortgage+calculator', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains text related to a mortgage calculator, suggesting a lure to entice users to click the malicious link.

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.ru/123?keyword=swoffers+mortgage+calculator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f95017d62cf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f8efa6805af3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5f91d650eb93c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5f9171a3b4ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f899e325ee56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/fetegoxakojisu.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/dubudesax.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/316897342.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/vabudofudi.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/manegebutodanasizowanifom.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/vocabulary_in_use_upper_intermediate_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1394/5513/files/light_void_icon_pack_apk.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_off00019a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A2F 5396 bytes
SHA-256: f96ab3b0ced695a8e839462c334428eddf7acfd55d45413e7f14345612a9e63d
font_01_sfnt_off0001ac86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC86 10868 bytes
SHA-256: 083cafa8376ffa1b5f9be057af200d1707dcea86612d893333d8a2596a9f0b4a

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