Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83547b5d44bc077…

MALICIOUS

PDF

56.9 KB Created: 2020-08-31 07:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d4ee8c99531c324168c991aa8fa3d17 SHA-1: 0e2bb18713b50b5861c95d2eb72f24253a240c49 SHA-256: d83547b5d44bc077952e75d54d58f32abf39f4e877bd43ed624ca988697449b8
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting the document's primary purpose is to direct users to malicious infrastructure. The presence of numerous Shopify links, including one for 'game_android_mod_apk_offline_2016.pdf', indicates a potential attempt to disguise the malicious intent within a large collection of seemingly legitimate links.

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=method+of+undetermined+coefficients+pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7598/files/game_android_mod_apk_offline_2016.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/mavam.pdf
    • https://cdn.shopify.com/s/files/1/0437/8987/7405/files/rebezodawikuxap.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1690/files/understandable_statistics_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3186/files/20031563253.pdf
    • https://static.usrfiles.com/ugd/599f1c_79e47cd4fe944634afb9518f198bb1ad.pdf
    • https://static.usrfiles.com/ugd/c0b427_31e042f159fe4d288c47bdcfbbd3d457.pdf
    • https://static.usrfiles.com/ugd/97368a_9f0d929ce7ec4d7da44bbac08e05791a.pdf
    • https://static.usrfiles.com/ugd/269bb8_46b6398210a94e24b0e0833003c9b5fb.pdf
    • https://static.usrfiles.com/ugd/e3325f_325511fd27b6417996daec103acb9626.pdf
    • https://static.usrfiles.com/ugd/2ac701_f0d8ddd370a446538b5737c17f7f513b.pdf
    • https://static.usrfiles.com/ugd/ce5d00_a0b13912ca2b482fa4c60eac82aea03f.pdf
    • https://static.usrfiles.com/ugd/c1de29_2ec5dcb7dd5e49cd90b301924126a147.pdf
    • https://static.usrfiles.com/ugd/217d68_d59237da0c77497d975a4485059170f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_361361c48d774611bbb67d4743eaf568.pdf
    • https://static.usrfiles.com/ugd/ea2f88_c185d3d2d4a64305aefcb9b4dd0bdc52.pdf
    • https://static.usrfiles.com/ugd/a1fb72_29546947409843fab05329ad73fb1c79.pdf
    • https://static.usrfiles.com/ugd/26481d_bce66115f38849e2acdf4e11e1db85ed.pdf
    • https://static.usrfiles.com/ugd/930050_4cfe2f41301b412a87a90c3defb0a57e.pdf
    • https://static.usrfiles.com/ugd/d5415a_b591e490a4ee422b8e787227bcbb7432.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008005.bin
eb486ffd1920b26153a4524f60e0df28b6a628fd3317337d325931b56d7e99ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8005 5160 bytes
font_01_sfnt_off0000916f.bin
f422268e10948382dc1a7a3e8ea5056bc52393c9fa3d9a4a00f5c61313e2336b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x916F 14880 bytes
font_02_sfnt_off0000c054.bin
eb541025a89add431753841f06b779fb21471f53cf2230301e723c27875d1c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 16320 bytes

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