Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1231d86c67e171…

MALICIOUS

PDF

41.2 KB Created: 2020-08-30 13:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87c7542eafd3fd9cd14ea21b9783ecd SHA-1: 6b7773e8394f9a494a3992a926b02c18bfc60e82 SHA-256: 2e1231d86c67e1713f2fd6f26c0602e0b043d32fcb8f74f269dac9db11164623
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'new super mario bros download pc' and the malicious URL, suggesting a lure for users to download unwanted software. The presence of a link farm heuristic further indicates an attempt to distribute malicious 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.com/wix?keyword=new+super+mario+bros+download+pc
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/sofivibinijedaxanotije.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1719/files/nidupikanufalow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/43004460085.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/15734438269.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/pokemon_game_ds_emulator_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://static.usrfiles.com/ugd/87b9a8_68ca87f8d39b449bbd850cecf8cd95f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c0e81e80f6f48d1b4e6e5446f1b6d5c.pdf
    • https://static.usrfiles.com/ugd/90c678_d089936df08141bf89a1e3932065f30f.pdf
    • https://static.usrfiles.com/ugd/269bb8_3c7cfe8cbce048b4af81dcfdbd74f085.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/60014432549.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9575/files/facebook_videos_online_by_link.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_off00005c13.bin
9e9e3a24cc0f2d6a994f8576357b6f90a6ed09fe5b9115e12a6df3046c79cacd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C13 5420 bytes
font_01_sfnt_off00006e73.bin
1d4d983a11506bc635dfe53d4b737f01e8f284a89c81b9a158c0b6d070734111
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E73 15728 bytes