Malicious PDF — malware analysis report

Static analysis result for SHA-256 1629a742c4bbe11f…

MALICIOUS

PDF

40.3 KB Created: 2020-08-09 15:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e3cc0fb09283580a1ae362cac0b2d2e SHA-1: 051098637f8c0d52255ed5d00422dfc60971c82b SHA-256: 1629a742c4bbe11f261e33579b020df35c5f02fd141a7215c39944bb6b0d4f61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a book PDF, which is then redirected through the malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=aghora+book+2+pdf
    • http://files.seworiginal.org/uploads/1/3/1/4/131438188/6007955.pdf
    • http://files.purplepotters.com/uploads/1/3/0/7/130739699/fopuni-wulol-sezabuwerefuwo.pdf
    • http://files.centerlinemovement.com/uploads/1/3/1/3/131398452/sowosezubeliz.pdf
    • http://files.rockinstreetwear.com/uploads/1/3/0/7/130739274/9533637.pdf
    • http://files.glowmedspacc.com/uploads/1/3/1/4/131482819/2770110.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.pdf
    • https://cdn.shopify.com/s/files/1/0435/2969/9482/files/96468210187.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/scotts_6._5_hp_lawn_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0454/6691/0872/files/clinical_pharmacology_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/16188158568.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/61439976605.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/woruf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/varicela_y_embarazo_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0716/4064/files/xuvamituxatumisaf.pdf
    • https://cdn.shopify.com/s/files/1/0448/3258/7936/files/typhoid_fever_cdc.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/retroarch_keyboard_controls.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/dulawewodixewukeriz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/zajamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/zowamikodesibizuz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fd9.bin
e309b8016e749b061b1bd0ca8ef29197531c65a3512c5d9b06f2bd714d4e7b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD9 5420 bytes
font_01_sfnt_off00007244.bin
8e55659ab181fdbbc713c0e6f5279cd14cbea5274a7a00c7b16381ad5c3bbf36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7244 10004 bytes

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