Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff65e7994ecef333…

MALICIOUS

PDF

125.7 KB Created: 2020-09-11 20:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcae5cd445859226f9ca8754d20d7299 SHA-1: fe5b7e2f59c4c31ad29927a89e43ca337a10265d SHA-256: ff65e7994ecef3330e531cf1a5d7687a1ed41cc010b27fae2022d11e3f85d1bf
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=liberia+map+pdf'. This URL is embedded within the document body, suggesting a phishing or social engineering attempt to direct the user to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous links to external PDFs, likely for SEO manipulation or to obscure the primary malicious destination. The ML classifier strongly supports the malicious verdict.

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=liberia+map+pdf
    • https://static.usrfiles.com/ugd/c345b0_62adf0f2a4d949a5b5d80cc60e035b62.pdf
    • https://static.usrfiles.com/ugd/c836c3_43700a33adb645c68419e2fe8dcaccb5.pdf
    • https://static.usrfiles.com/ugd/9e14ca_1d3e6c1bbae645d394b570a0125407aa.pdf
    • https://static.usrfiles.com/ugd/f103bb_6c37058daf2a44219f09ab4cfdf8a064.pdf
    • https://static.usrfiles.com/ugd/140efa_a16eb8fac1704bc2b9b983d320f09594.pdf
    • https://static.usrfiles.com/ugd/ac1638_9d3a19c7defe468fabe899a2d045e9f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_00fb4376e5414629938bd228697599e9.pdf
    • https://static.usrfiles.com/ugd/71fd01_45404e39bf5745419a112dbf8933bae5.pdf
    • https://static.usrfiles.com/ugd/599026_025e1de8d3f54465b96310dc60ab5bf5.pdf
    • https://static.usrfiles.com/ugd/0d9a50_8c343d9924e84db2a23aadcd96671682.pdf
    • https://static.usrfiles.com/ugd/3eb4bd_0fa1f8d549774818818e737090de1ef1.pdf
    • https://static.usrfiles.com/ugd/7dd30d_9807fc8e7f894c21b365038264b5f325.pdf
    • https://static.usrfiles.com/ugd/fef806_51dfa7a3d9664b47b4a6aea450c7d2d4.pdf
    • https://static.usrfiles.com/ugd/a98ecc_c310605b74ff42719af65af2d0d3810c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7153104b2f4e4ed4bfcd29b37267f57e.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/dabujukipoviteri.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/sesotho_bible_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1590/files/coplanar_waveguide_with_ground_via.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/lizuxolaxixovapapara.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_off00019ac0.bin
a48d22fddad769174f6cc2006f0bb329dd603d48a9a2adfad7e6325620a2dc0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19AC0 3036 bytes
font_01_sfnt_off0001a589.bin
0c36a87f9e7f535e6a608e6c119879a5dd69f6934c121458dd62f31be03374af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A589 5056 bytes
font_02_sfnt_off0001b6a0.bin
e6ef2e60784fb222a7d23cd735e1da3303402563e422bb6b40a0efe8dee3f60b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6A0 16068 bytes

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