Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0021aba8b687a9…

MALICIOUS

PDF

41.8 KB Created: 2020-08-24 22:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9374103abe171267204d169f81b2d77 SHA-1: a0a1e96021d1b05b4f4c7310f7d5cccd8f4cc842 SHA-256: cf0021aba8b687a90d4d7613bbe0202942597e4bbd30b886585964655ca83239
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a significant number of embedded links, many pointing to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent of leading users to potentially harmful content.

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/pify?keyword=photoshop+blur+action
    • http://files.sdnsa.com/uploads/1/3/0/7/130776230/66ca31cf5ebb6.pdf
    • http://files.pineriverbasketball.com/uploads/1/3/0/9/130968993/dipunetam-zajobezabupol.pdf
    • http://files.mariposacelebrations-eventmanagement.com/uploads/1/3/2/6/132682106/cc6e895908e8e09.pdf
    • http://sesulipo.annaumc.org/uploads/1/3/2/6/132682663/e6092e1acb1d.pdf
    • http://files.dunphyshandguntraining.com/uploads/1/3/2/6/132681566/d354c601d.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/bahra_lv_cables_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/94972413526.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/mantoux_positive_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/waneliboranu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/apj_abdul_kalam_bani_in_bengali_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/37001640470.pdf
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/gevifizezupofaselaxus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6573/7370/files/mumesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1173/files/55012150984.pdf
    • https://cdn.shopify.com/s/files/1/0460/0781/2257/files/41732832388.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/60234941376.pdf
    • https://cdn.shopify.com/s/files/1/0465/0870/3894/files/caller_id_apk_app.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_off000065cb.bin
1b2aeb2322c1524be12787de3082f4b4e692b4d020bae71f39702733b0a9aed7
pdf-font-stream PDF embedded font (sfnt) at offset 0x65CB 5164 bytes
font_01_sfnt_off00007749.bin
9870626daeb0da5e7c4e284a5daa3ca9ffd7f10f32b616214de68ded926116c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 10260 bytes