Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9770396a066875d…

MALICIOUS

PDF

37.5 KB Created: 2020-08-14 06:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22ff4743458e2f06056e68a10c1057c8 SHA-1: 17cad1767241405b381cd40caf1e743fb66feff9 SHA-256: a9770396a066875d02b92c180d5434c0d758c20649e9e524c26ff5c0ff18492d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'ib physics mechanics questions and answers' and the malicious URL, suggesting a lure to academic content. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via a deceptive link within the document.

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=ib+physics+mechanics+questions+and+answers
    • http://files.pattyschroeder.com/uploads/1/3/0/7/130738846/zununabadut.pdf
    • http://gitukuza.turnerschool.com/uploads/1/3/1/3/131379732/banupasunukozuwi.pdf
    • http://files.bioguardpest.com/uploads/1/3/1/3/131381363/viwijexiza.pdf
    • http://files.amplifiedmobiledj.com/uploads/1/3/2/7/132710624/6fc352d82.pdf
    • http://files.custom-installation-2020-vision.com/uploads/1/3/2/6/132681062/5520068.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0430/8218/6905/files/68188828093.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/selasirefukepodewatejewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2030/4034/files/92632937556.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/mudofizobaluve.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3791/files/remozi.pdf
    • https://cdn.shopify.com/s/files/1/0449/2584/5659/files/ryobi_miter_saw_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/suxijamajivepifev.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/zolewamad.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/tizuzukeputowopeza.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8262/files/womizefilawepujatukumuka.pdf
    • https://cdn.shopify.com/s/files/1/0447/3287/4901/files/carbon_nanotubes_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/lugeje.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_off000048c9.bin
5a9d3f8d474ca289858afb2473fb477b1606cba1fc8e1124d3e2a2e4bcde0cd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C9 5680 bytes
font_01_sfnt_off00005bee.bin
9a52fd4cb406a6bbc2c312c8239793f8491d20fd4cec5e1db204b46a5d2a7941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEE 2188 bytes
font_02_sfnt_off000065d0.bin
793d36300d9536ed513072ceebf5fe69b6ff7ebd3d77ecbbfe2606a053bcf4c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 10024 bytes

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