Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23f1a26a615ae51…

MALICIOUS

PDF

39.5 KB Created: 2020-08-23 16:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e1c311d760cb655091a04c91ba54259 SHA-1: 40f6ca3bb2065bf4de5c51e7b3b1ca24dc96f0c8 SHA-256: c23f1a26a615ae519be07e002595bb93d61aa2f696e22a1e7be5eaf486754d92
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=free+chillstep+music, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'free chillstep music' and lists numerous PDF links hosted on shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=free+chillstep+music
    • http://files.aislingmcgloughlin.com/uploads/1/3/0/7/130738741/jufakuka-kamus-jidawanub.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/jasisodelareruzawus.pdf
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/goxomabagodulaxokuna.pdf
    • https://cdn.shopify.com/s/files/1/0462/8162/1664/files/cambridge_english_advanced_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/breviario_de_alarico.pdf
    • https://cdn.shopify.com/s/files/1/0447/0043/4586/files/cessna_421_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/92667636641.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/luwuvavamamefilelete.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_off00005de1.bin
89cd99741556c52da48a5036d55c8f191384416fa3d2df4858cc473fec480099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE1 4916 bytes
font_01_sfnt_off00006e76.bin
5bc982e0bbdae84940fbdb38aa77aab6fa188bf2444d02d057e1c02c3d541843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E76 10420 bytes

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