Malicious PDF — malware analysis report

Static analysis result for SHA-256 868e24176217b104…

MALICIOUS

PDF

47.7 KB Created: 2020-08-31 16:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a69548efa6dc51dd9acc269dfa8d0649 SHA-1: 2175493cbf389a5360efe2cb175d86a3cca25b29 SHA-256: 868e24176217b1048f0aff15f1b6f5d23d6023e0e9a4fa402a0936ee6995c650
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, includes the malicious URL and references to other PDFs, suggesting a link farm or redirection scheme designed to lead users to 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.com/pify?keyword=harris+teeter+sheet+cake+designs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/1ee69b_1faf9795f09f4cd98ba5a20cfc05a031.pdf
    • https://static.usrfiles.com/ugd/ce14f3_4d6173bc317e4324bbf41db4d48d4216.pdf
    • https://static.usrfiles.com/ugd/19ce5d_24dbf40007f0441480afc1f7e58bfde8.pdf
    • https://static.usrfiles.com/ugd/d1d005_e1e305cbbc0f4683aad6797af82ea59c.pdf
    • https://cdn.shopify.com/s/files/1/0437/1962/2808/files/transferir_contactos_icloud_para_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/selamuzatorabonuxoluziko.pdf
    • https://cdn.shopify.com/s/files/1/0434/5574/2114/files/vevuderivajagererunuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/duwaxufezemurogagur.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/desktop_audio_visualizer.pdf
    • https://cdn.shopify.com/s/files/1/0437/8145/6023/files/zekuxanose.pdf
    • https://cdn.shopify.com/s/files/1/0435/7616/4515/files/six_pack_shortcuts_workout.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/48355455600.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c89821c0d3b47179eb2d5a74a5db638.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3625d85e0564200a1a4d28d1576a5a4.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_0d7c43a567414763827f37291311639a.pdf
    • https://static.usrfiles.com/ugd/b65acf_b738744b2c164cb08511c83f9118a3b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3adabb3da63441b94fc10baf91845ec.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f75.bin
f72c3d97a90a2ec16283e2379f1b77082b4df65630d7f0f3e9975d10593282ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F75 4872 bytes
font_01_sfnt_off00007fee.bin
11498183557a709e30ff3444b9b7004d7686151df18ffe2be7123a420a18d789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEE 10380 bytes
font_02_sfnt_off0000a375.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA375 4324 bytes

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