Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef796a2d2a4ff14…

MALICIOUS

PDF

42.3 KB Created: 2020-08-10 18:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcb7aa1f85416ef016d3c3a8b187e443 SHA-1: e4c9e92b2a584384a73a9cd796a0a747ada496a0 SHA-256: 5ef796a2d2a4ff1406a4ab7ca0cd77c47b5d90a704f54ff3973c42356f6f4d3c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body also contains this URL, presented alongside text related to online PDF conversion, suggesting a lure. The presence of numerous other PDF links, many pointing to Shopify, indicates a potential link farm for SEO manipulation or traffic redirection. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=online+pdf+converter+to+word+online+free
    • http://files.rouxtaipei.com/uploads/1/3/1/3/131379506/jozuzep.pdf
    • http://files.mkhmfg.com/uploads/1/3/0/8/130874352/bajab.pdf
    • http://files.uk.lollandfalsterairport.dk/uploads/1/3/1/4/131406658/7326236.pdf
    • http://files.menopausalmommyrants.com/uploads/1/3/0/9/130969837/nilesogesakila_wewedo_vanuv_xepomatem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0451/6282/3834/files/creativity_invention_and_innovation.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/19266991965.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/fisopipasizitulekamavurod.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/72705324243.pdf
    • https://cdn.shopify.com/s/files/1/0438/9673/3864/files/30013191554.pdf
    • https://cdn.shopify.com/s/files/1/0437/5370/1525/files/android_studio_3._3_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/92344894192.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/rurimenedinosoresat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/tutorial_de_excel_intermedio_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/95384706705.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/20532153239.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lunizededalusabunis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a4b.bin
07723ab2129caf87f19ceaee861bdb4fcba8d3f6aeafaae35d838c2c3dc73585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4B 4728 bytes
font_01_sfnt_off00006a7d.bin
b9468f563af26baf8b7fd6b80f446f3fc40ec8861a029630493b6784695bc688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7D 10348 bytes
font_02_sfnt_off00008de8.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE8 4324 bytes

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