Malicious PDF — malware analysis report

Static analysis result for SHA-256 013870cd7cc4aef7…

MALICIOUS

PDF

48.9 KB Created: 2020-07-31 10:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51ea6e4a6f99cd3c62718c98cc7003a SHA-1: 069704b1d02970a3cf19e9284974d55cdfefcbe0 SHA-256: 013870cd7cc4aef7fa61c0b5516a20bfc05651684cbf88a3acf362b22201a3e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'anorexia nerviosa tratamiento pdf', likely intended to trick users into clicking the malicious links.

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=anorexia+nerviosa+tratamiento+pdf
    • http://files.creativeleanings.co.uk/uploads/1/3/2/6/132683135/lixoz_jomapuxa_teridawojusika.pdf
    • http://files.diaryofadesitck.com/uploads/1/3/1/4/131407292/d6f8ae70384f4.pdf
    • http://files.lushgardenhotels.com/uploads/1/3/0/8/130874493/nejefepega-mefupesigulaz-fumufazeve.pdf
    • http://files.iohmf.co.uk/uploads/1/3/1/4/131482944/6438862.pdf
    • http://files.johnredekercards.com/uploads/1/3/1/3/131379944/5821950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/64787753013.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/71407776181.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/36549089362.pdf
    • https://cdn.shopify.com/s/files/1/0438/0547/4978/files/fuxijuzivot.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/84060309326.pdf
    • https://cdn.shopify.com/s/files/1/0435/0921/9492/files/39514220051.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/11040699709.pdf
    • https://cdn.shopify.com/s/files/1/0433/6825/1543/files/31612527015.pdf
    • https://cdn.shopify.com/s/files/1/0431/4248/0021/files/67719811477.pdf
    • https://cdn.shopify.com/s/files/1/0439/1324/8923/files/damofumew.pdf
    • https://cdn.shopify.com/s/files/1/0434/7671/3637/files/fanunotom.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/buzapuvitosifiropo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/9658050407.pdf
    • https://cdn.shopify.com/s/files/1/0433/9829/9813/files/35898924301.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_off000083d4.bin
b951105064df3616e05767848ba290c05d4cef9b66b7361a4d58e732ac6c56d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D4 5060 bytes
font_01_sfnt_off000094ee.bin
2800f88edea97e1ea7f9833515248255269f211176360b3064afbaa811ef8cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94EE 9800 bytes

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