Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f75e83915e8616…

MALICIOUS

PDF

52.2 KB Created: 2020-07-30 18:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f09cfd4b58aceb6e421265fea9c6f401 SHA-1: dd9f2f2a24f948e643ae234fce4f7baf01fb77a4 SHA-256: 33f75e83915e8616250feea3ebed372b2fb03a4b4a34960df9f0f906213a0103
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Tratamiento antimicotico pdf'. The presence of a link farm and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

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=tratamiento+antimicotico+pdf
    • http://files.caralarmandradio.com/uploads/1/3/2/8/132814977/8ca24203b89382.pdf
    • http://files.citybeerfest.org/uploads/1/3/0/7/130776639/5b50a69444.pdf
    • http://files.hardwaresolutions-la.com/uploads/1/3/1/1/131164314/matulufasixodu.pdf
    • http://files.grannysherbs.com/uploads/1/3/1/3/131379409/4952658.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/fapimododuvitodalasetinod.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/8454161499.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/84640083144.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/pojujuzirunes.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/88332258006.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/49746667802.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/12927958992.pdf
    • https://cdn.shopify.com/s/files/1/0428/2771/0630/files/72492934908.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/tekinoxilitawixiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8290/6789/files/kovejadumo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7438/8119/files/zefosugamubuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/kinidasumi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/dukozisimejopudatolaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/nukoxodomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/11530111594.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000a78d.bin
566c74067da6cf18f4e1fca67b975625b0618421b43db315d0f61d71308ac90e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA78D 17528 bytes
font_00_sfnt_off000073ca.bin
d9325dd5b218f4f9bed40b892a70b89670cccb65b728088e6665de58bec032a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 4828 bytes
font_01_sfnt_off0000840e.bin
152a1eee23b8d0bc1221b6e746f20893c23f067a5e420dfe2ddd8ca3f377fa62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840E 10900 bytes

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