Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a82e2ef64739a8…

MALICIOUS

PDF

44.3 KB Created: 2020-08-02 05:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dda97a83f317f354e8e1f396b841120d SHA-1: fd989802f66213e2583eb4da9dabb12b139e94be SHA-256: 23a82e2ef64739a89a33873e079cb551941aacdbf49abbc8d1b2ed3e052beaad
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to ttraff.com, a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=simplicity+sewing+machine+manual', suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=simplicity+sewing+machine+manual
    • http://files.independencebaptistchurchtx.com/uploads/1/3/0/7/130775135/ed339592aa0d0.pdf
    • http://files.webbcityfarmersmarket.com/uploads/1/3/1/3/131384663/nulisejiwigebad.pdf
    • http://files.watkinsdeals.com/uploads/1/3/1/3/131398176/5040110.pdf
    • http://files.hopeshomeopathics.com/uploads/1/3/2/6/132681448/vurukikubajujuziles.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/kepamunewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/26010740240.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/xorifekakomuwisekivu.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/mofemegiwevukifukubaguta.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/zevapibegonebitaruwajeta.pdf
    • https://cdn.shopify.com/s/files/1/0433/4573/9941/files/nexamurugigoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/29508119601.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/jowipenesur.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/toxomegineritexulibelaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2371/files/64592974490.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/52177359975.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7696/files/wivupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/19401999900.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_off00006eba.bin
afcd47e1d1dbdc05873883465d1fe5014b6b934ea580537f125648dee70c29a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBA 5548 bytes
font_01_sfnt_off0000818b.bin
2ee92adbce9bbe3531c15c7daad16c5a19beafb4e18d9dbe19a66bafbb834421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x818B 10140 bytes

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