Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c2e430d821bf3d…

MALICIOUS

PDF

55.6 KB Created: 2020-08-21 03:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e02eae78d0966b85833cc03ce908b5d SHA-1: b95a497ba7fdd8c621490e1cbc8f33ac3744456b SHA-256: e5c2e430d821bf3d7b2648268cbc00d94584323dfaf4583a609d34b2b3259554
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=barracuda+firewall+admin+guide, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to "Barracuda firewall admin guide" and the URL, suggesting a social engineering lure to redirect users to malicious infrastructure. 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.cc/pify?keyword=barracuda+firewall+admin+guide
    • http://files.instep360.org/uploads/1/3/0/7/130740490/jipulisifa_pisos_baripanozeb.pdf
    • http://files.rawbellionjuice.com/uploads/1/3/0/7/130776149/rewowumobodukuz-mavuxepize-visubazo.pdf
    • http://files.jotuncap.com/uploads/1/3/2/6/132695388/milufiluxejolor_tugudarosawidi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9978/1275/files/11949880750.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6496/files/67815863472.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/46767328540.pdf
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/8346689005.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/begebulivepijupadi.pdf
    • https://cdn.shopify.com/s/files/1/0454/2945/7064/files/the_v_games.pdf
    • https://cdn.shopify.com/s/files/1/0436/6155/7913/files/xivusetaxujiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/sivomexipavisejopupaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/catering_service_project.pdf
    • https://cdn.shopify.com/s/files/1/0438/1641/9488/files/xujudamusube.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/topojojasutakiziwajebit.pdf
    • https://cdn.shopify.com/s/files/1/0451/0108/8921/files/femutiwitetoritaboposofaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/37565380699.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/zoneseruvetelubuwab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6975/0940/files/eagle_scout_letter_of_ambition.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
stream_005_off0000adaf.bin
3c7f12e20e3319f1ceea95c2490d03f348a9c35ea1c2f84d8f9133b6035774f3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xADAF 21180 bytes
font_00_sfnt_off000076c2.bin
537bff2a50d63f0a3e92bd840e04315bb322e37c978adada544e8507b61c6758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C2 5304 bytes
font_01_sfnt_off000088c8.bin
19497a75e04ac8baeb83fa58c3a70acee6a8e04050f5a58fd1d1a7abca8a9f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88C8 10788 bytes

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