Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c1219c98434d43…

MALICIOUS

PDF

49.4 KB Created: 2020-08-06 17:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b830c3ec694b943a33a6d64de35b7646 SHA-1: 36e3db0a73039bc5c27ec273ca3c7b5a6b778fff SHA-256: 04c1219c98434d43d7bb5d6d4df5538aa5e44820877d9ea3e8789c566a7b41fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources. One prominent URL, 'https://ttraff.com/pify?keyword=android+sqlite+tutorial+for+beginners+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of providing a tutorial. 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=android+sqlite+tutorial+for+beginners+pdf
    • http://files.smartministriesinc.com/uploads/1/3/0/7/130738751/zonivejup.pdf
    • http://dokureg.downsouthbait.com/uploads/1/3/0/8/130814575/4157376.pdf
    • http://files.foxgloveapothecary.co.uk/uploads/1/3/2/6/132681901/kolibazewonenabase.pdf
    • http://files.ruskinhouseofshepherds.com/uploads/1/3/1/4/131482946/rimigunidu.pdf
    • http://files.aedpfingerlakes.org/uploads/1/3/0/8/130813859/427389.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/1585/4490/files/7710697263.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/sirizoxija.pdf
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/91371442147.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/13614926212.pdf
    • https://cdn.shopify.com/s/files/1/0437/0939/9192/files/achieves_ncoer_bullets.pdf
    • https://cdn.shopify.com/s/files/1/0430/3591/8489/files/42553314841.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/79671995166.pdf
    • https://cdn.shopify.com/s/files/1/0437/2096/6298/files/wokovudiwivasuwofokekodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/verunubukaralomesik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5309/files/91059396409.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/zuzikavisibaw.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_off00006d2f.bin
bc87529f590243bcaf79fc7c7264d725ab402d040add39128de1e3530148ad9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 5344 bytes
font_01_sfnt_off00007f54.bin
b3e26fc74eb0370ea645e6d27d1eefd89c2df131ca804c83e3b9e8069f9368b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F54 13320 bytes
font_02_sfnt_off0000aa1a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA1A 4324 bytes

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