Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce39e089f365a402…

MALICIOUS

PDF

64.0 KB Created: 2020-07-31 10:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2c7f73d4fe9cd057766630d5dab7bb0 SHA-1: c0fcbe8972f527f2f722e2808632425073b6e850 SHA-256: ce39e089f365a402b903ea91165cfe36498d604018790c2597c8f080a8db1596
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a large number of external links, many of which point to a link farm hosted on Shopify. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=chemistry+notes+for+bsc+3rd+year+pdf', is identified as a malicious redirector. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure.

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=chemistry+notes+for+bsc+3rd+year+pdf
    • http://files.tuscanpta.org/uploads/1/3/0/8/130815213/da6634093682c.pdf
    • http://files.mametcalfe.com/uploads/1/3/2/8/132814567/galomakanivet-tumorifujita-modiwa-lujaga.pdf
    • http://files.hstmasia.org/uploads/1/3/1/8/131857115/fapusoxibezeteduso.pdf
    • http://files.cupelocal748.com/uploads/1/3/1/3/131380107/nalisulas_radojukiv_foretiwobobep_jexaxawitunu.pdf
    • http://files.jennydixonbeach.com/uploads/1/3/0/7/130776033/1674082.pdf
    • http://files.cupelocal748.com/uploads/1/3/1/3/13138010
    • https://cdn.shopify.com/s/files/1/0430/8982/1847/files/88291361903.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/56209969806.pdf
    • https://cdn.shopify.com/s/files/1/0440/6896/2469/files/62448460201.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/90087812874.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64830269039.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/94904169907.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/71709230078.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/60446056272.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9229/files/desevil.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/nuweb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tapowizilefaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29318048561.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bd2.bin
8313735f82e55151b54848fdc4cd99599a7f683707dadf8e7dc6134c12aba147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD2 5580 bytes
font_01_sfnt_off00009ea0.bin
55635b50bad29c6b04cd9b4d5dd064b78be6c29eafc981c666da6fe4470a6799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA0 3204 bytes
font_02_sfnt_off0000ab90.bin
6979bd47582e1076a00d5472c1190b3af330e4342ab9b9f0dc7d58f6ae02f5fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB90 2576 bytes
font_03_sfnt_off0000b683.bin
64412b92acb300abf6a0c73945ff71badcf2d0852c5abf80668507a468f8be20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 11092 bytes
font_04_sfnt_off0000db91.bin
aead5909105c2c91be994e936b990d4ad0f64aef1ebd7ea7814b21a3d287ff12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 16260 bytes

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