Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba2fc748e4d7039…

MALICIOUS

PDF

46.1 KB Created: 2020-08-11 13:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c490895a917cb260c3035578477fe2d1 SHA-1: 507cfeef9f86cff79e7ec7f368fbc93c944657a9 SHA-256: 8ba2fc748e4d7039e22d6d780c6704d1276c0c7df38171c52bc3fb61dd6bf789
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The document body, though malformed, contains the URL 'https://ttraff.ru/pify?keyword=balanceamento+redox+exercicios+pdf', which is a known malicious redirector. The presence of numerous links to external PDFs hosted on various domains suggests a link farm or a distribution mechanism for further malicious content.

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.ru/pify?keyword=balanceamento+redox+exercicios+pdf
    • http://files.organizedtreasure.com/uploads/1/3/0/7/130775952/ludubukofarob_gexob_kumivomijuf_xudubomuretota.pdf
    • http://files.ocswimcall.com/uploads/1/3/2/6/132696465/6552502.pdf
    • http://wuzejus.friendsofhartmountain.org/uploads/1/3/0/9/130969742/bfe5d.pdf
    • http://files.scatteredsacred.com/uploads/1/3/2/6/132695351/7dfb983c8e70.pdf
    • http://files.ndsubisonrobotics.org/uploads/1/3/1/8/131857213/nikajizuvituder-kawojuwipudane.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6661/files/vimaferonezomegoseba.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6163/files/kobatozobibaxixil.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/52815091855.pdf
    • https://cdn.shopify.com/s/files/1/0433/6720/2974/files/24052549482.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/acknowledgement_for_training_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/absolutismo_frances.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/91808827636.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/milaja.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/33623885417.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/99117682108.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/chemistry_form_2_structure_and_bonding.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/toxukisobimadu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/d_d_short_rest.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_off00006b91.bin
feb7b0a231daa5869376ede745e3710e8328e703e54e7a1fa61048461e3e1f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B91 2864 bytes
font_01_sfnt_off000075c1.bin
d569138ee01d71fc57b4f5ce2fe9320a8d2eca314a1a0ca6f75e570ded85c7a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C1 5420 bytes
font_02_sfnt_off00008812.bin
4fc73b78f9b8b4cf1b17867864d2836f2f7f272d304e3cca1df98d93bfe0d295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8812 10436 bytes

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