Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b0a4c658b5ec04…

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 00:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8de2380de06d4a6074067f0e0cd4933 SHA-1: ae73e4cd97d938484df50676d09e2be42683d6e8 SHA-256: 10b0a4c658b5ec04415df27ae20147864b07cfd926987eab0d9b50c643fbc83b
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 a redirector service known to host malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that is also flagged by the redirector heuristic, suggesting an attempt to lure users to malicious infrastructure.

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=what+is+trade+unionism+pdf
    • http://zufigopow.cosscommunications.com/uploads/1/3/1/3/131379698/wimojozu.pdf
    • http://files.samuelpenderbayne.com/uploads/1/3/1/4/131452903/noroliwitavutovaxu.pdf
    • http://files.ayurglo.com/uploads/1/3/2/7/132740620/labiwubamulit.pdf
    • http://kutofajok.njokphotos.com/uploads/1/3/0/7/130739777/jolab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/sasuke_minecraft_skin.pdf
    • https://cdn.shopify.com/s/files/1/0434/0426/3585/files/96446735025.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/pitexibopelewuf.pdf
    • https://cdn.shopify.com/s/files/1/0441/0923/4328/files/intellichlor_ic40_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/84903582282.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0437/7241/2055/files/jabilifemoregavuzi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3996/files/trait_de_versailles_texte_intgral.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/pdf_to_word_converter_online_free_for_large_documents.pdf
    • https://cdn.shopify.com/s/files/1/0438/1828/7266/files/step_down_transformer_design_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/voviwasumobavupeboxusafom.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3155/files/cheat_codes_gta_5_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0434/2769/2695/files/33613263607.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000684a.bin
5b4d3d33078f739ddb3806315a669d3488d3ae85ffa07becb64e27b04c614b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684A 5264 bytes
font_01_sfnt_off00007a0d.bin
f04b2bffb6cc1a2a2572e8ba6f9ae3124dc48bde4c0a1b18080367f83cbeae6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0D 10396 bytes

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