Malicious PDF — malware analysis report

Static analysis result for SHA-256 613df5eb60707055…

MALICIOUS

PDF

51.5 KB Created: 2020-08-09 05:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dcfadd9cbc179fcbab3146f59cca70c SHA-1: 5e8d529e3108d1fe4974ea5b191557733d7acb14 SHA-256: 613df5eb6070705513f3b4270cf6d97dfce934091698bbc16347b5551372c535
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Alcohols phenols and ethers mcqs pdf', suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to distribute malicious 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.ru/pify?keyword=alcohols+phenols+and+ethers+mcqs+pdf
    • http://files.alexandreotti.com/uploads/1/3/2/3/132302907/wunux.pdf
    • http://files.bombexnovelties.com/uploads/1/3/2/7/132740337/b7a286225d93f25.pdf
    • http://files.jessicaleighwellbeing.com/uploads/1/3/1/4/131406275/a1368e4f6cf718.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/seladabuxibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/45611758409.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/saridufen.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2767/files/rojijugovarul.pdf
    • https://cdn.shopify.com/s/files/1/0435/1629/7368/files/29164160464.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/47263262940.pdf
    • https://cdn.shopify.com/s/files/1/0428/6752/3743/files/18343199740.pdf
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/24574886654.pdf
    • https://cdn.shopify.com/s/files/1/0450/4797/1990/files/danny_phantom_season_3.pdf
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/5743791217.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3482/7162/files/complete_scales_and_arpeggios_for_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/mirufupepaz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d73.bin
889ff55b6105bc113f842c338f6c68e264262f237761790661000647fb8a9288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D73 5508 bytes
font_01_sfnt_off00008002.bin
f84292e9bd46d6d1262605497334589a903edfa4b1068de0b39c9f5b98b5bda2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8002 13520 bytes
font_02_sfnt_off0000ab09.bin
bcce05ca6db5d8cdfb08e45fd21adc2e6e4d066094484eb1158a28fc209d5eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB09 16364 bytes

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