Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc9a77f097e180d…

MALICIOUS

PDF

46.1 KB Created: 2020-08-13 23:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2409676277ec20d921f518527126f003 SHA-1: 973d7f32513ddf1f8b5e01f0cbe400b17fc6d248 SHA-256: abc9a77f097e180dc446f010380806e87e2a16df43a69c52444d0a0d75a4ca47
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.cc/pify?keyword=map+questions+and+answers', points to a known malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users by overwhelming them with links, many of which lead to benign Shopify domains but are likely part of a broader distribution scheme.

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.cc/pify?keyword=map+questions+and+answers
    • http://fuxeseni.joachimkoops.com/uploads/1/3/2/8/132814930/1702244.pdf
    • http://files.liverpoolsouthcircuit.org/uploads/1/3/1/0/131069781/903081.pdf
    • http://files.smalltowntheatrics.org/uploads/1/3/2/6/132682039/rapulotimujibojowed.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/73475837946.pdf
    • https://cdn.shopify.com/s/files/1/0436/1987/7026/files/lonokowij.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5837/files/48332584239.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/gogonewanaziwuto.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/43981916668.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1247/files/jurnal_titrasi_argentometri_metode_mohr.pdf
    • https://cdn.shopify.com/s/files/1/0438/2444/7638/files/95791264985.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/associative_memory_in_computer_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/pixoleruse.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/shri_aditya_hridaya_stotra_in_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/54708059606.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/28250452920.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/vevewasagizefapunodi.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_off000077b7.bin
5e77fe7957e24ef913fbb6423ef7024436e5495c547ddb6aa8e51ba136936555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B7 5144 bytes
font_01_sfnt_off00008956.bin
ccb63b1036efcdc89bf18c2e1478aeacb7edd0e7da3ad8b9b0737860146c55ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8956 10096 bytes

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