Malicious PDF — malware analysis report

Static analysis result for SHA-256 2102140e9b890df6…

MALICIOUS

PDF

40.3 KB Created: 2020-08-03 13:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a6a23b8705c532ea0e3744c9b0f890d SHA-1: d2ad95eff53da171ed4eba6186c0ef151e92e9b3 SHA-256: 2102140e9b890df6214e33b0ad9c97a5ee61c0a394c3898c701e0a9502d2641b
152 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 download for a creative writing PDF. This link, 'https://ttraff.com/pify?keyword=download+buku+creative+writing+pdf', points to known malicious infrastructure. The document also features a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the primary intent appears to be luring users to a malicious redirector.

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=download+buku+creative+writing+pdf
    • http://files.mdeykute.com/uploads/1/3/1/8/131856160/d73c318.pdf
    • http://babosane.youngachieversokc.org/uploads/1/3/0/7/130775219/3172839.pdf
    • http://files.ayurvedaora.com/uploads/1/3/1/6/131606642/rexuxulejeda_popumepajilorem_vizuluv_nukajesadi.pdf
    • http://files.sailongrain.com/uploads/1/3/0/8/130874554/xaxixabupuwas_xagosokuji_sowujisem_kidexuwene.pdf
    • http://files.lakefieldskatingclub.com/uploads/1/3/1/6/131606546/9014223.pdf
    • https://cdn.shopify.com/s/files/1/0434/9489/9864/files/jadinesej.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/palejofuferodewovurut.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/kodegidalabekokebovupafim.pdf
    • https://cdn.shopify.com/s/files/1/0437/8820/6238/files/snake_game_javascript_code.pdf
    • https://cdn.shopify.com/s/files/1/0438/9715/9832/files/talabejuzowovuredipokikoj.pdf
    • https://cdn.shopify.com/s/files/1/0439/9028/6494/files/89352289323.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/61552029507.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/94560520667.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/76543438589.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2165/files/jukowutopuburozawop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005289.bin
0b2029c9c0cbe7081465b86e52f6325d08ab7df078965de9e802620acf71a5d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5289 5380 bytes
font_01_sfnt_off000064ff.bin
b2b479349f7f840eb1941f52449d698bfe49fc173bc982bac8e3edecb30713d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FF 9732 bytes
font_02_sfnt_off00008615.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8615 4324 bytes

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