Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecf93d4809a114b…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 16:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed81d02df589c1f6cb38eb6b29ae7f84 SHA-1: e4737315e7a4a753dad6f1c663f2ed96555541bf SHA-256: eecf93d4809a114b2805aedda6c5cd56315b0247da34a2764c4c88ca93f17552
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text related to 'algebraic geometry problem solving' and the malicious URL, suggesting a lure. The presence of a link farm heuristic further indicates an attempt to distribute malicious content. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious redirection attempt.

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/wix?keyword=algebraic+geometry+problem+solving+approach+pdf
    • https://cdn.shopify.com/s/files/1/0439/1567/3752/files/jizifisute.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/libros_de_quimica_de_tercero_de_bachillerato.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/photoshop_could_not_parse_the_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/physical_asset_management_handbook_john_s._mitchell.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/70373854245.pdf
    • https://static.usrfiles.com/ugd/99965f_5b361cbae4cf421bb58c25743414919f.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdb8c915d5d04509a775216ffb8b7c2c.pdf
    • https://static.usrfiles.com/ugd/696b8a_aee79857ad59496594a3831aa520e882.pdf
    • https://static.usrfiles.com/ugd/ae15ca_e6071d4b824f4e47a11c2ef19683ec04.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dd76032c2fb4879846c6c50cf3f39df.pdf
    • https://static.usrfiles.com/ugd/e5a943_0d2e218132ea4a4d8412818f731f3215.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_281a87fb4dce41ba8d7a8f44a165a6fd.pdf
    • https://static.usrfiles.com/ugd/3dd68e_bf40e1d4ac054fddb5e519d0fb708f0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceddf993e4b54ec79a7a96f85822c09f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e670042cac344c49b87044d1014db7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0615030b34e94baab4a6cb96bc143ad6.pdf
    • https://static.usrfiles.com/ugd/b8c837_32f6563762d24f5e9b8764a9afd3a3ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6eba044e763446e97e044e59ea99c06.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bf3d8c6071a45e3a927d926aac3c04e.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_off000055c4.bin
0e4710e242cec0fd2d86f99fce240dbfdbee8becce41f9fc514ca7149b1b1eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C4 5860 bytes
font_01_sfnt_off0000698a.bin
a04eadae5993e3b2be0cf6e6cc5c2beae2b2d844927c7c78e094865f2af0aa45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698A 10376 bytes

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