Malicious PDF — malware analysis report

Static analysis result for SHA-256 a016e32deba32787…

MALICIOUS

PDF

48.5 KB Created: 2020-08-07 15:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f0f26a51272385503ef71e08ee30f3 SHA-1: aa346b617a27a9a6f323195a8fe5558e5e670bd9 SHA-256: a016e32deba3278771ed183d756fd0fa08709362944d2810f36c85b69e00f154
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'pain assessment tools nursing pdf'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing site or download further malware. The ML classifier strongly supports the malicious nature of this PDF.

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=pain+assessment+tools+nursing+pdf
    • http://files.hawifinearts.com/uploads/1/3/2/6/132695586/cda4fbfe2a1f8e3.pdf
    • http://zefonitus.downonthefreedomfarm.com/uploads/1/3/1/4/131406749/mumedawatuvoxobovaj.pdf
    • http://guzuk.southbuffalowheelhouse.com/uploads/1/3/0/9/130969352/4774218.pdf
    • http://files.jackofall3.com/uploads/1/3/1/6/131637014/4241086.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/kagemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1804/3040/files/rovalorikiwuwefikun.pdf
    • https://cdn.shopify.com/s/files/1/0434/2104/0789/files/cardiology_secrets_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9624/files/86089945888.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/rixogopexutuserep.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/31912445851.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/reduce_dpi_of.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rofimoluxita.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/acidoctose_diabtique_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/71129853929.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/defekugumivam.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/68577530402.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_off000072d5.bin
a3ea21fac0b6538f41aff5aad522041f6fcf78a31ce99e7b85be49ede631e742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D5 5244 bytes
font_01_sfnt_off0000848d.bin
f034a480731f816b6713ce218270ac9732c195b08ed687bfafac6840d94c3314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848D 10084 bytes
font_02_sfnt_off0000a71e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA71E 4324 bytes

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