Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51b330fab48ddf2…

MALICIOUS

PDF

30.1 KB Created: 2020-08-27 20:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce9dbeb5d1b977e115a55aeb9741f5a0 SHA-1: 14c6afd98b936fb8d40fa4c835da668a0334b39a SHA-256: e51b330fab48ddf2a59491ad43ebd722f0d1370b77511329cbdc5a2b5f03ce87
172 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing, and contains a critical heuristic firing for a malicious redirector link. The primary malicious URL, https://ttraff.ru/pify?keyword=porto+luna+1+villasimius, is directly embedded and likely serves as the initial point of compromise. The document also hosts a large number of other PDF files, suggesting a link farm or content stuffing technique.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 30 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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/pify?keyword=porto+luna+1+villasimius
    • http://files.startoonz.com/uploads/1/3/1/4/131482832/2703948.pdf
    • http://rutiru.drtmobilevetcare.com/uploads/1/3/0/9/130969953/vesiwajefif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/fuzonupokuwezisuxasis.pdf
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/cerebrovascular_disease_review.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7641/files/paruwedemaxaxot.pdf
    • https://cdn.shopify.com/s/files/1/0437/3974/2369/files/satisfaction_benny_benassi_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://cdn.shopify.com/s/files/1/0463/3228/0994/files/94061561487.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/cbse_answer_sheet_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/zakerirufefokuwevete.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1054/files/aflatoxin_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/brahmacharya_ke_sadhan_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3549/0466/files/soldier_of_fortune_chords.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_off0000400e.bin
8767733516c9d3e9091ad889d28df6e7641835768a025c40c7c9c899686a4d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x400E 4944 bytes
font_01_sfnt_off000050ce.bin
8f5dd70d5a474ecec5d427e607180ea2d3fcb2e7bd25f0179a15ec05cf22ec1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50CE 8084 bytes

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