Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10cf59a4c7104f5…

MALICIOUS

PDF

44.2 KB Created: 2020-08-30 04:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e413055116ebc272d4cd0147ef1592b SHA-1: d9c98d2bc84b0629cd4e5a4a3b6f200020d8330b SHA-256: a10cf59a4c7104f5ea04f7a870a1ca63c7c6ce509af9007c49840f7815dcee2a
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One of these URLs, https://ttraff.ru/wix?keyword=ulnar+entrapment+exercises, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a primary intent to redirect users to potentially harmful content. The file was generated by wkhtmltopdf, a tool often used to create documents for SEO manipulation, further supporting the link farm hypothesis.

Heuristics 3

  • 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.
  • 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=ulnar+entrapment+exercises
    • https://static.usrfiles.com/ugd/5de1df_813c2ac45fbf4aa9abe4577cafde1fe9.pdf
    • https://static.usrfiles.com/ugd/0adedf_27248de8d1e1422fb8cdb971f0965c6b.pdf
    • https://static.usrfiles.com/ugd/b58d21_b9cc062e031e471d9c841fe2f635e3fb.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/bell_bottom_movie_kannada_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1781/files/ludazusisivirumose.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/57837024660.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/25668619543.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/wedemawowadonemawirile.pdf
    • https://cdn.shopify.com/s/files/1/0464/9415/4904/files/beer_bottle_neck_labels_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/8384/8097/files/ajmal_sajid_saraiki_songs_mp3_Bedava.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5091/files/barista_lavazza_case_study.pdf
    • https://static.usrfiles.com/ugd/271e65_d87c2677b2ae4f96aef066ecb4cc113b.pdf
    • https://static.usrfiles.com/ugd/c20ea7_d6b3fd4e1c2c4306ad56042ee7e87b8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_393e1c2745cd476e9e03f675baba9934.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_off00006f15.bin
d2aa29e940da7653442ca206a76e00544ca2d18085cc27af161fe8dc3f34eb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F15 5140 bytes
font_01_sfnt_off00008079.bin
69592a4dd5546a19d77170948490c04a49f964408123f138630ba8225331c35c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8079 10376 bytes

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