Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b4dcaa4413e699…

MALICIOUS

PDF

47.5 KB Created: 2020-10-17 00:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d9e32981c469382872f306d4d19d769 SHA-1: 2647ca439142717c59ba63b03b02e4179490b6fc SHA-256: c4b4dcaa4413e6998853b0e040d0cdadfd53c3f10e5bc0c0c8d29238ca34d21b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, characteristic of a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to converting images to PDF, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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.link/123?keyword=como+converter+imagem+em+pdf+online
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f8743da80cb6.pdf
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f870406951f8.pdf
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f86ff71654a3.pdf
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8705a9bcaac.pdf
    • https://uploads.strikinglycdn.com/files/792992d4-ae59-4e40-a94a-b32a6df83cc2/54998689026.pdf
    • https://uploads.strikinglycdn.com/files/415d7f03-5e0f-4451-8332-dd96f91c370e/68222953049.pdf
    • https://uploads.strikinglycdn.com/files/52a5f2de-2e6b-437c-a695-1c2be108e412/jijojuritod.pdf
    • https://cdn.shopify.com/s/files/1/0480/9441/2963/files/bulasujikowin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/9_major_animal_phyla_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/14331785116.pdf
    • https://cdn.shopify.com/s/files/1/0494/4773/1359/files/silebenimowusaruvapawos.pdf
    • https://cdn.shopify.com/s/files/1/0477/3937/1676/files/el_amor_debe_ser_firme_james_dobson.pdf
    • https://cdn.shopify.com/s/files/1/0502/9173/6741/files/12v_to_5v_converter_raspberry_pi.pdf
    • https://cdn.shopify.com/s/files/1/0492/4106/3590/files/social_security_hearing_office_eugene.pdf
    • https://cdn.shopify.com/s/files/1/0433/8978/0124/files/quantum_glory_free.pdf
    • https://uploads.strikinglycdn.com/files/d315430d-f7b2-49b4-8171-6b4cb80aeba7/56877690181.pdf
    • https://uploads.strikinglycdn.com/files/a2f75164-986d-4ae1-a4ca-c0502fd16f87/gokadosifi.pdf
    • https://uploads.strikinglycdn.com/files/53543ca8-23e1-4321-959b-255d11ea5e5b/9080494105.pdf
    • https://uploads.strikinglycdn.com/files/262dc8e2-59a8-44f0-b97d-e6405dc9352c/fatolamudosataxubadutumi.pdf
    • https://uploads.strikinglycdn.com/files/b0e82974-3f8c-4bc9-ae16-0fe23f606204/46729200095.pdf
    • https://cdn.shopify.com/s/files/1/0501/9490/7314/files/xaxirolubopesasaxakilug.pdf
    • https://cdn.shopify.com/s/files/1/0430/3162/5882/files/73022356247.pdf
    • https://cdn.shopify.com/s/files/1/0437/1303/6439/files/spotify_mod_apk_offline.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_off0000640b.bin
07528f2c5fbc9f7ceed52ddb7a84264dee12279d70c3f641c0df2e8df2f09347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640B 5168 bytes
font_01_sfnt_off0000758a.bin
19d1ad56537273b0217d2b3770ab1bb587ec36211b1e08f70e3f4921b116d072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758A 14348 bytes
font_02_sfnt_off0000a1d5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D5 4324 bytes

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