Malicious PDF — malware analysis report

Static analysis result for SHA-256 6872cf825c73fa88…

MALICIOUS

PDF

46.7 KB Created: 2020-08-09 19:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb81d9c0ce8cf45d29c06e71176ca86b SHA-1: 58d724523c446c7388763252869912c79ded336b SHA-256: 6872cf825c73fa88041aa51f7ba90db19b0dad3aaf5417cf5ecd2e14c89a5de3
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for free PDF downloads, which is a common tactic for phishing or malware distribution. 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://ttraff.com/pify?keyword=automation+testing+interview+questions+and+answers+pdf+free+download
    • http://files.shoplevena.com/uploads/1/3/0/7/130739614/1072577.pdf
    • http://files.theyorksociety.com/uploads/1/3/0/8/130813834/3007.pdf
    • http://files.warnersroadtrips.com/uploads/1/3/1/6/131607005/vekilemederiw.pdf
    • http://files.walcoleather.com/uploads/1/3/1/3/131382590/825c8.pdf
    • http://files.globaldancearts.org/uploads/1/3/1/4/131407572/3514cb9caee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/my_dog_skip_cast.pdf
    • https://cdn.shopify.com/s/files/1/0438/1795/9586/files/data_structures_and_algorithms_in_java_5th_edition_goodrich.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5975/files/c_sort_array.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8402/files/mawafuxopilab.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/wufewetakiku.pdf
    • https://cdn.shopify.com/s/files/1/0440/9258/8184/files/six_sigma_yellow_belt_study_material.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7555/files/jokosuzuvukalexurozufuno.pdf
    • https://cdn.shopify.com/s/files/1/0435/8550/3393/files/energias_renovables_en_el_peru_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/mimuzobisexopupasumerumuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/5560/3094/files/does_steam_work_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/brahms_lullaby_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/capacitation_of_sperm.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_off00006aa8.bin
3375e8a0b595e3e519e0ec9791dff5f27f6b9543b3e14bcedde063efb41597f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA8 5508 bytes
font_01_sfnt_off00007d4e.bin
2d55553d24e44e3f370ecd734468dc19a213c8ba6d7714b3384b90188de9a9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4E 9796 bytes
font_02_sfnt_off00009ee9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE9 4324 bytes

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