Malicious PDF — malware analysis report

Static analysis result for SHA-256 36278f291c6942f7…

MALICIOUS

PDF

42.4 KB Created: 2020-08-03 20:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15d1ce4636aa421415e90b08192524e2 SHA-1: 3a7f34b6c9a64d4a7f88517bf3cb778557bbe172 SHA-256: 36278f291c6942f7a359b5299d4e7a6ea226cdcfa07e48cff4b9f2da5fd8aea4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=syarat+akreditasi+rumah+sakit+pdf`. 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.cc/pify?keyword=syarat+akreditasi+rumah+sakit+pdf
    • http://files.signorimanisalonandspa.com/uploads/1/3/1/3/131398323/tifazupamit.pdf
    • http://files.aileenfletcher.com/uploads/1/3/1/6/131606262/xetizogeka_didaxu.pdf
    • http://kebetab.missmaryellenart.com/uploads/1/3/2/7/132740900/jagumabafudivov_gafatasuvovipix_rugutiliwileti_bugupuv.pdf
    • http://files.beckyradwaydanceprojects.com/uploads/1/3/0/7/130775435/gevemile_pobikov.pdf
    • http://files.jhtheatricals.com/uploads/1/3/0/8/130873718/7342810.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/zisipevabatujeruzomexevuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7933/files/80301509111.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/wirafutafoziwiguvimifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/fikorererazuwiburunazalob.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0730/files/9696228561.pdf
    • https://cdn.shopify.com/s/files/1/0437/5743/7080/files/bevalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8596/3169/files/bebalalajelejulijizif.pdf
    • https://cdn.shopify.com/s/files/1/0438/4659/8816/files/rubujokusolujetuduz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/19856666290.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/mekelujatumevuto.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/49506077272.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/64396447222.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/woluwarewixumiko.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006792.bin
54b12c5b58e3f428231175b709198e059a9e6f766b700dc4ac042a896f4f23e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6792 5520 bytes
font_01_sfnt_off00007a35.bin
acf97a6277e1a426d87686c99c3a98afaa494b05c805047dbe65df0a79eedad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A35 10116 bytes

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