Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dffe34ae3649fa…

MALICIOUS

PDF

108.4 KB Created: 2020-11-02 22:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0f8b42925e73c20568991f1b4cb889de SHA-1: 66f7beb87ca58468b5b16618b3d89973456f69e8 SHA-256: 79dffe34ae3649fad3808751eff70d42c4dd841ae4c556b5e5d5022abf39f2c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links to other PDF documents, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, 'https://ggtraff.ru/wb?keyword=portuguese%20lyrics%20to%20the%20girl%20from%20ipanema', is identified as a known malicious redirector. 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://ggtraff.ru/wb?keyword=portuguese%20lyrics%20to%20the%20girl%20from%20ipanema In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_5f91d51628fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_5f9a8263dc904.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/rijudadubawif.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/8074942.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/1/0504/8886/9055/files/2010_camaro_ss_horsepower.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6664/4384/files/osrs_mobile_f2p_money_making_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3495/7762/files/30901324291.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/73626730969.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6677/5456/files/dragon_warrior_4_weapons.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/math_analysis_honors_-_worksheet_48.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2084/7768/files/bafosur.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tegedulexakativawik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5958/2373/files/bisofejituvitab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/9603/1391/files/diferencia_ser_humano_animales.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/rejezazuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/bhagavata_purana_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/4730/5635/files/35786207463.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_off000162b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B2 5532 bytes
SHA-256: 2cebe168857fb9e2e18fb4b000f8ba6614b493436e9cc038e6f8e5e65972be80
font_01_sfnt_off00017563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17563 15388 bytes
SHA-256: f9677d9f98b0d1fb265a509acfe969bd23389f7b268b32881f30515bc16b0d7a