Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ac7411bdcc0c72…

MALICIOUS

PDF

38.1 KB Created: 2020-08-20 14:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320565735433cebcd6fcae9900eb1301 SHA-1: fee9ea2819cff9aa4a2c545c583fce39072e2487 SHA-256: d4ac7411bdcc0c722bdf918bc9c71c6f9a1fc8a4aeb9b96075d61c329bf93a5b
152 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains the malicious redirector URL and several other URLs, suggesting a link farm or redirection scheme designed to lead users to harmful content. No scripts were extracted from this sample.

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=classical+music++sites+free
    • http://kiduruniw.domesticagenda.org/uploads/1/3/2/6/132695675/galopokidav.pdf
    • http://files.patriciascudamorehiltoncatt.com/uploads/1/3/2/6/132695216/786ea283f5465d7.pdf
    • http://selem.cakessweetstreats.com/uploads/1/3/2/3/132303382/8937467.pdf
    • http://repupol.creativegeniuswithin.com/uploads/1/3/0/8/130874030/1345278.pdf
    • http://zarad.sweetblackberry.org/uploads/1/3/0/8/130813747/27f4e10168.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5288/files/verizon_fios_cancel.pdf
    • https://cdn.shopify.com/s/files/1/0443/8904/0294/files/google_sheets_split_text_to_columns.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/32661969485.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/72337236474.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/einstellungstest_agentur_fr_arbeit.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5607/files/45262380191.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/dakomekidobetoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/2831/6313/files/33347024042.pdf
    • https://cdn.shopify.com/s/files/1/0430/9988/1639/files/augmented_reality_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8500/3926/files/hashimoto_s_protocol_izabella_wentz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/11712485507.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_off00004bd5.bin
88f4663182e38f3e98619c18c30f6bdb9228d9b42ab635496799e6f3081f1c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD5 4716 bytes
font_01_sfnt_off00005bdc.bin
88c39eb34a3663fbe25c0bb3fda910e380d5fda5c9265fc76636a77cc27dc518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDC 9852 bytes
font_02_sfnt_off00007d6d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6D 4324 bytes

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