Malicious PDF — malware analysis report

Static analysis result for SHA-256 73aa05dac9330a7f…

MALICIOUS

PDF

45.4 KB Created: 2020-08-12 05:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa490684aba7ea9103dd032c303143e3 SHA-1: 65bdbecc09d6ed0594cad3ec0b384b70cda42250 SHA-256: 73aa05dac9330a7f48a43313fd3f3979dd621b7efc5e0b181fcc5cb99367c6a8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spamming operation. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=maslow
    • http://jinumu.shootlikeagirlllc.com/uploads/1/3/0/8/130874493/kepijonefofesarutis.pdf
    • http://files.ilovehalfmoon.com/uploads/1/3/0/7/130740591/kabutakedis_dagizevul_wafuwopuvozig.pdf
    • http://files.detailexpressutah.com/uploads/1/3/2/7/132712225/kumowota.pdf
    • http://files.landscapegardenerscamberley.co.uk/uploads/1/3/1/4/131453028/vezelexel-wovisuj-filavidowadonu.pdf
    • http://files.vclavender.com/uploads/1/3/0/8/130813998/3ac6ea882a6db8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/jivekaku.pdf
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/wenatabulezuwif.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6314/files/packers_bengals_stream.pdf
    • https://cdn.shopify.com/s/files/1/0430/6036/3413/files/zefezawexab.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/modeling_agency_company_profile.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3486/files/90763617804.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/classic_wow_cooking_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/xobegozabasidevenoritan.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/bsc_physics_honours_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/bsf_radio_operator_model_paper.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/70214597175.pdf
    • https://cdn.shopify.com/s/files/1/0434/8713/3860/files/97404050858.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/17548477422.pdf
    • https://cdn.shopify.com/s/files/1/0437/8358/5953/files/gokakelosisolotupoxi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007336.bin
e2c062d8ac37493d7db48e767abed02727159666b2c5b3c834ab68fe061f2cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7336 5476 bytes
font_01_sfnt_off000085ee.bin
a6868f9c363480ae3d333788eee0828ae31214289370feddc1faccd0a596caf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85EE 10056 bytes

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