Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44769cabeae12f3…

MALICIOUS

PDF

38.4 KB Created: 2020-09-01 18:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4afaaf4c277dcd083da95a0210a413 SHA-1: 1e58453f6566f8b6195614e0315eed517bed58ef SHA-256: c44769cabeae12f39c5b69df592d4cd947dc7d3c589050c2dd9fd49b0b60f131
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search result for 'Pocket anesthesia 2nd edition pdf'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL leads to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm designed to manipulate search engine results, likely to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=pocket+anesthesia+2nd+edition+pdf
    • https://static.usrfiles.com/ugd/b8c837_66c63703024c45c3942bc6ac7713b1aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_d27470ce9b60460db4db6588a0ddc319.pdf
    • https://static.usrfiles.com/ugd/4ae4db_5f7f887039f14d928849949f3f783654.pdf
    • https://static.usrfiles.com/ugd/3b7182_ae732a31c8564c329a55687812f315f0.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/jajofudebodov.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/couper_fichier_gratuit_en_ligne.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5519/files/93576355889.pdf
    • https://cdn.shopify.com/s/files/1/0433/2254/0185/files/wasted_sound_effect.pdf
    • https://cdn.shopify.com/s/files/1/0462/1300/5466/files/wpf_hierarchicaldatatemplate_treeviewitem_style.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/jatotim.pdf
    • https://static.usrfiles.com/ugd/aff7ca_c785abcf6be541a787ec545faa943587.pdf
    • https://static.usrfiles.com/ugd/d5415a_d69b00500ab44a25b1debc357238edb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_bce76958acca4ee8b33d930e28c5ea4c.pdf
    • https://static.usrfiles.com/ugd/8b49c6_af9e684f558d45e8ade558b0aa8cc097.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_off00005830.bin
ec167d37f00d939f2042f172f08fbdc5c89cac346d2ea12c803eae344027fd89
pdf-font-stream PDF embedded font (sfnt) at offset 0x5830 5312 bytes
font_01_sfnt_off00006a4f.bin
b9472debf4cc5d2182593ff78424da6b9b002818d4841e4a9c4737470d49d6a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4F 10236 bytes