Malicious PDF — malware analysis report

Static analysis result for SHA-256 53424b89a3157241…

MALICIOUS

PDF

47.1 KB Created: 2020-08-07 17:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 304ad329ffc8bb134dd34c25788657c0 SHA-1: 190be075156bf685d51eb0effc90921c418ee289 SHA-256: 53424b89a315724171652b089eca01835ad1e6ad31ffaa3ffde919bf86994067
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on Shopify. One prominent link, 'https://ttraff.com/pify?keyword=acca+f9+past+papers+with+answers+pdf', is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure under the guise of providing academic resources. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=acca+f9+past+papers+with+answers+pdf
    • http://files.halfgodtactical.com/uploads/1/3/0/7/130775102/c6457.pdf
    • http://files.kathmiddletonbooks.com/uploads/1/3/2/7/132711999/0411520c1e5.pdf
    • http://files.wslr-pc-np.org/uploads/1/3/1/4/131483009/7ee6e.pdf
    • http://files.andymcracing.com/uploads/1/3/0/7/130740262/ruxonero_lerulu_buxapiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/bitsat_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5675/files/calendrio_da_liga_nos_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xikidewutuxazumal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/33791435584.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4383/files/90340997387.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/fi_zilal_al_quran_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/cazadora_de_hadas_valiente.pdf
    • https://cdn.shopify.com/s/files/1/0436/1161/9491/files/retimavokoxegetegol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59577082877.pdf
    • https://cdn.shopify.com/s/files/1/0432/3321/4621/files/duvozoni.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/bunan.pdf
    • https://cdn.shopify.com/s/files/1/0434/0862/1719/files/nowijesuraxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fejekav.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006610.bin
640804ce7729b17ce290441bf2b0cb8f1b8e8109d2730c120735d4a3a5c977ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6610 5448 bytes
font_01_sfnt_off000078a4.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A4 1800 bytes
font_02_sfnt_off00008132.bin
2a26b0334aa498c6c7116385874d0fde6659af53c65873ca85ed1235d663a174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8132 14696 bytes

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