Malicious PDF — malware analysis report

Static analysis result for SHA-256 79784e76986d5d71…

MALICIOUS

PDF

41.5 KB Created: 2020-09-04 05:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4281a323bb79710d6a22aff696fcc2ab SHA-1: d26986e4d46f21e4c0b322156ed83aa0c1f5c0e8 SHA-256: 79784e76986d5d71c21de1c62c33f3e7f36e233d392fbfa62f71692bda1aca93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=molecular+compound+nomenclature+worksheet'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector URL suggests an attempt to lure the user to a harmful site, likely for phishing or to download a secondary payload.

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=molecular+compound+nomenclature+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/278743_c8d1de4f1d1a4de3a376773e76f4cc82.pdf
    • https://static.usrfiles.com/ugd/8f6098_87d064dcdc544ffca54710f2fc4d6b1c.pdf
    • https://static.usrfiles.com/ugd/0d2908_1951cccc66be4e509d3b5150a109b8db.pdf
    • https://static.usrfiles.com/ugd/724fb5_4eb6a4ab91e9427a8cc088cabb4c41a4.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2932/files/97487123314.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/39545200721.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/centroids_and_center_of_gravity.pdf
    • https://static.usrfiles.com/ugd/03ae60_5786e663351443b69d2911c80d9aca96.pdf
    • https://static.usrfiles.com/ugd/b8c837_456581d623724a0ba0fe5da1d497ffa4.pdf
    • https://static.usrfiles.com/ugd/868401_ce33b7a0f7254a7fa7a971b4bf7f01f0.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1085/files/rotodafifa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/69985239324.pdf
    • https://cdn.shopify.com/s/files/1/0435/4804/9572/files/carl_sagan_pale_blue_dot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/bontrager_ion_700_R_USB_svtlomet.pdf
    • https://cdn.shopify.com/s/files/1/0438/7795/7800/files/shankar_bhagwan_ke_naye_gane.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006111.bin
ffcac62ec5f5652ba55ebcae2df7d693f21876ff16f60a6d69f46f6b18a6575d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6111 5472 bytes
font_01_sfnt_off0000739d.bin
b3e76487f224d9d4a74fd610f6119539baf8903dad1965c28214e6544bf6e713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739D 10508 bytes

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