Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaef62966938a6e…

MALICIOUS

PDF

59.7 KB Created: 2020-09-03 05:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f61d47c3ecc9f79f54d5f2500d87dcf7 SHA-1: 588af2094c1dae8ac1dc7e66f11544f03655ee6f SHA-256: 3aaef62966938a6efd452156f5f7d00e924143581e7f5a7f331419bb6bbe1aba
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=autumn%2527+s+concerto+ost+piano+sheet', which is flagged as malicious. Additionally, a large number of links to static.usrfiles.com were found, suggesting a link farm or content distribution network used to host further 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.link/wix?keyword=autumn%2527+s+concerto+ost+piano+sheet
    • https://static.usrfiles.com/ugd/41a0b6_f199f6cd81a04ea19aacff8bc9035a0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_53563f3050d540fdbe3476f48b28e3ae.pdf
    • https://static.usrfiles.com/ugd/7041e4_d53772c5458a4b318a3f5f7a4c7b631d.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/idiot_s_guide_to_crochet_granny_square.pdf
    • https://cdn.shopify.com/s/files/1/0429/6153/5132/files/vevipukewozureragofitu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9240/files/red_sox_coloring_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/bengali_tv_serial_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/rakeje.pdf
    • https://static.usrfiles.com/ugd/e6e573_4596a8c3b06a49c0824a603e74b00017.pdf
    • https://static.usrfiles.com/ugd/0f5b72_ee8cfb82b8f74a0b860ac3630bf81cd8.pdf
    • https://static.usrfiles.com/ugd/3e5db3_8e4e34eb92514303937bf0b67e3009f9.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000679a.bin
5ceb1d1f64fab4eee30f8bc631f08bae6f8b4388c8abedc85e91cf748affa6e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679A 11608 bytes
font_01_sfnt_off00008d24.bin
324f0b9279041165ebdb9d594982258b75e3be63284ed781d7550c99ad018739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D24 5164 bytes
font_02_sfnt_off00009e8f.bin
f102ea1886561db2dbc9987cb600adca0f5b8b998d8acf38e99e43f94a6f7cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8F 13604 bytes
font_03_sfnt_off0000c9c8.bin
b1a7be413c16529a3efb36790fb1ede9dbc47b99b1dcf399fe3ce16d881d47c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 16416 bytes

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